Understanding Triangles for Grade 15

Front

Equilateral Triangle

Back

sides equal, all angles 60°

Front

Isosceles Triangle

Back

sides equal, two angles equal

Front

Scalene Triangle

Back

sides and angles different

Front

Right Triangle

Back

angle is 90°

Front

Acute Triangle

Back

angles less than 90°

Front

Obtuse Triangle

Back

angle greater than 90°

Front

Sum of Angles in Triangle

Back

latex="180^\circ">

Front

Area of Triangle

Back

latex="\frac{1}{2} \times \text{base} \times \text{height}">

Front

Pythagorean Theorem

Back

latex="a^2 + b^2 = c^2"> (right triangle)

Front

Heron's Formula

Back