 ## Geometry Calculators: (55) lessons

3-dimensional points
Free 3-dimensional points Calculator - Calculates distance between two 3-dimensional points
(x1, y1, z1) and (x2, y2, z2) as well as the parametric equations and symmetric equations
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Angle Ratio for a Triangle
Free Angle Ratio for a Triangle Calculator - Given an angle ratio for a triangle of a:b:c, this determines the angle measurements of the triangle.
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Annulus
Free Annulus Calculator - Calculates the area of an annulus and the equation of the annulus using the radius of the large and small concentric circles.
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Bretschneiders Formula
Free Bretschneiders Formula Calculator - Calculates the area of a quadrilateral using Bretschneiders Formula
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Cardioid
Free Cardioid Calculator - Shows you the area, arc length, polar equation of the horizontal cardioid, and the polar equation of the vertical cardioid
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Cevian Triangle Relations
Free Cevian Triangle Relations Calculator - Given a triangle with a cevian, this will solve for the cevian or segments or sides based on inputs
Calculator

Chord
Free Chord Calculator - Solves for any of the 3 items in the Chord of a Circle equation, Chord Length (c), Radius (r), and center to chord midpoint (t).
Calculator

Circles
Free Circles Calculator - Calculates and solves for Radius, Diameter, Circumference, and Area of a Circle.
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Clock Angle
Free Clock Angle Calculator - Calculate the angle on a clock between the hour and minute hands or how many times on the clock form an angle of (x°) between the minute and hour hand (backwards and forwards). Clock Angle Calculator
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Clock Hands Meet
Free Clock Hands Meet Calculator - Calculates the first time on a clock when the hands will meet or touch again.
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Cones
Free Cones Calculator - Calculates and solves for Radius, height, Volume (Capacity), Lateral Area, and Surface Area of a Cone.
Calculator

Consecutive Interior Angles
Free Consecutive Interior Angles Calculator - Shows you a proof of consecutive interior angles using parallel lines and a transversal
Lesson

Cube
Free Cube Calculator - Solves for Volume (Capacity), Lateral Area,Surface Area, and the value of a side for a cube.
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Cuboid
Free Cuboid Calculator - Calculates the volume, surface area, diagonals, and space diagonal for a cuboid
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Cylinders
Free Cylinders Calculator - Calculates and solves for Radius, Diameter, Volume (Capacity), Lateral Area, and Surface Area of a Cylinder.
Calculator

Decagon
Free Decagon Calculator - Solves for the side, perimeter, and area of a decagon.
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Equilateral Triangle
Free Equilateral Triangle Calculator - Given a side (a), this calculates the following items of the equilateral triangle:
* Perimeter (P)
* Semi-Perimeter (s)
* Area (A)
* altitudes (ha,hb,hc)
* medians (ma,mb,mc)
* angle bisectors (ta,tb,tc)
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Euclidean Geometry
Free Euclidean Geometry Calculator - Shows you the area, arc length, polar equation of the horizontal cardioid, and the polar equation of the vertical cardioid
Lesson

Eulers Formula for Planar Geometry
Free Eulers Formula for Planar Geometry Calculator - This calculator solves for any one of the 3 following items using Eulers Formula for planar geometry:
* Vertices (v)
* Faces (f)
* Edges (e)
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Geometric Mean of a Triangle
Free Geometric Mean of a Triangle Calculator - Given certain segments of a special right triangle, this will calculate other segments using the geometric mean
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Golden Ratio
Free Golden Ratio Calculator - Solves for 2 out of the 3 variables for a segment broken in 2 pieces that satisfies the Golden Ratio (Golden Mean).
(a) Large Segment
(b) Small Segment
(a + b) Total Segment
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Hemisphere
Free Hemisphere Calculator - Calculates the base circumference, volume, curved surface area, base surface area, total surface area of a hemisphere with radius r
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Heptagon
Free Heptagon Calculator - Solves for side length, perimeter, and area of a heptagon.
Calculator

Hexagon
Free Hexagon Calculator - This calculator solves for side length (s), Area (A), and Perimeter (P) of a hexagon given one of the 3 entries.
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Isosceles Triangle
Free Isosceles Triangle Calculator - Given a long side (a) and a short side (b), this determines the following items of the isosceles triangle:
* Area (A)
* Semi-Perimeter (s)
* Altitude a (ha)
* Altitude b (hb)
* Altitude c (hc)
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Kites
Free Kites Calculator - This calculates perimeter and/or area of a kite given certain inputs such as short and long side, short and long diagonal, or angle between short and long side
Calculator

Nonagon
Free Nonagon Calculator - Calculates the side, perimeter, and area of a nonagon
Calculator

Octagon
Free Octagon Calculator - Calculate side, area, and perimeter of an octagon based on inputs
Calculator

Pentagons
Free Pentagons Calculator - Given a side length and an apothem, this calculates the perimeter and area of the pentagon.
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Pick's Theorem
Free Pick's Theorem Calculator - This calculator determines the area of a simple polygon using interior points and boundary points using Pick's Theorem
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Plane Geometry Operations
Free Plane Geometry Operations Calculator - Evaluates and simplifies various plane geometry notation and operations
Calculator

Polygon Side
Free Polygon Side Calculator - Determines the sides of a polygon given an interior angle sum.
Calculator

Polygons
Free Polygons Calculator - Using various input scenarios of a polygon such as side length, number of sides, apothem, and radius, this calculator determines Perimeter or a polygon and Area of the polygon. This also determines interior angles of a polygon and diagonals of a polygon as well as the total number of 1 vertex diagonals.
Calculator

Pyramids
Free Pyramids Calculator - Solves for Volume (Capacity), Surface Area, height, or radius of a Pyramid.
Calculator

Free Quadrilateral Calculator - Given 4 points entered, this determines the area using Brahmaguptas Formula and perimeter of the quadrilateral formed by the points as well as checking to see if the quadrilateral (quadrangle) is a parallelogram.
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Rectangles and Parallelograms
Free Rectangles and Parallelograms Calculator - Solve for Area, Perimeter, length, and width of a rectangle or parallelogram and also calculates the diagonal length as well as the circumradius and inradius.
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Rectangular Solid
Free Rectangular Solid Calculator - Solves for Volume (Capacity) of rectangular solid
Lateral Area of rectangular Solid
Surface Area of rectangular solid.
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Rhombus
Free Rhombus Calculator - Given inputs of a rhombus, this calculates the following:
Perimeter of a Rhombus
Area of a Rhombus
Side of a Rhombus
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Right Triangles
Free Right Triangles Calculator - This solves for all the pieces of a right triangle based on given inputs using items like the sin ratio, cosine ratio, tangent ratio, and the Pythagorean Theorem as well as the inradius.
Calculator

Special Triangles: Isosceles and 30-60-90
Free Special Triangles: Isosceles and 30-60-90 Calculator - Given an Isosceles triangle (45-45-90) or 30-60-90 right triangle, the calculator will solve the 2 remaining sides of the triangle given one side entered.
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Spheres
Free Spheres Calculator - Calculates and solves for Volume (Capacity), Surface Area, and Radius of a Sphere.
Calculator

Squares
Free Squares Calculator - Solve for Area of a square, Perimeter of a square, side of a square, diagonal of a square.
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Tetrahedron Marble Problem
Free Tetrahedron Marble Problem Calculator - Word problem using marbles in a cylinder jar that forms a tetrahedron.
Calculator

Torus
Free Torus Calculator - Calculates the volume of a torus and surface area of a torus given major radius and minor radius.
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Trapezoids
Free Trapezoids Calculator - This calculator determines the following items for a trapezoid based on given inputs:
* Area of trapezoid
* Perimeter of a Trapezoid
Calculator

Triangle Coordinate Items
Free Triangle Coordinate Items Calculator - Enter 3 points for the vertices of a triangle, and this will calculate the area of that triangle and the centroid.
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Triangle Inequality
Free Triangle Inequality Calculator - This calculator displays 2 scenarios
1) Enter 3 sides of a triangle, and it will determine if the side lengths satisfy the properties of the triangle inequality and form a triangle
2) Enter 2 sides of a triangle, and this will determine an acceptable range for the length of the 3rd side of a triangle so that the 3rd side respects the Triangle Inequality.
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Triangles
Free Triangles Calculator - This lesson walks you through the basics of a triangle and shows you triangle types like acute, right, obtuse, scalene, isosceles, equilateral.
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Two Column Proof
Free Two Column Proof Calculator - Shows you the details behind a two column proof including the five parts and examples
Lesson

What is a Line
Free What is a Line Calculator - This lesson walks you through what a line is and the various implications of a line in geometry
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What is a Perpendicular Bisector
Free What is a Perpendicular Bisector Calculator - This lesson walks you through what a perpendicular bisector is and the various properties of the segment it bisects and the angles formed by the bisection
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What is a Point
Free What is a Point Calculator - This lesson walks you through what a point is and the various implications of a point in geometry
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What is a Ray
Free What is a Ray Calculator - This lesson walks you through what a Ray is and the various implications of a ray in geometry
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What is a Segment
Free What is a Segment Calculator - This lesson walks you through what a segment is and the various implications of a segment in geometry including the midpoint of a segment.
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What is an Angle
Free What is an Angle Calculator - This lesson walks you through what an angle is and how to use it
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