What is a Triangle: A polygon with 3 edges, 3 vertices, 3 angles. We take 3 points and connect them with 3 sides below denoted as ΔPQR:
Properties of a Triangle: Sum of the three interior angles = 180°
Sum of the 2 sides > 3rd side
A triangle with vertices (points) P, Q, R:
is denoted as ΔPQR
Area of a Triangle With base b and height h:
A = 1/2bh
Acute Triangle: All 3 angles measure less than 90°
Right Triangle: Has one angle measuring 90° (right)
The other two angles < 90°
Obtuse Triangle: Has only one angle measuring > 90°
Obtuse angle is opposite the long side
Scalene Triangle No Sides Are Equal
Isosceles Triangle 2 sides Are Equal
Equilateral Triangle All 3 sides are equal
How does the Triangles Calculator work?
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.
What 2 formulas are used for the Triangles Calculator?
Triangle PQR is written as ΔPQR
The sum of the three interior angles of a triangle equals 180°
For more math formulas, check out our
Formula Dossier
What 7 concepts are covered in the Triangles Calculator?
acute triangle A triangle for which all interior angles are acute. equilateral triangle A triangle with 3 equal sides isosceles triangle A triangle with two equal sides and an unequal third side obtuse triangle A triangle which has an obtuse angle as one of its interior angles. right triangle triangle in which one angle is a right angle scalene triangle a triangle with three unequal sides triangle a flat geometric figure that has three sides and three angles
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