Pythagorean Theorem
a^2 + b^2 = c^2
Use for right triangles if two sides are known.
Isosceles
Two sides of equal length
Congruent Triangles
Triangles that have the same size and shape
Similar Triangles
Have the same shape. Each pair of corresponding angles has the same measure.
Triangle inequality
The sum of the lengths of any two sides is greater than the length of the third side
Regular polygon
Sides and angles are the same
Sides and interior angle formula
180(n-2)