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°