An isosceles triangle is a triangle with two sides that are the same length. Find the measure of the two equal angles to the nearest degree in a triangle that has sides of length 5ft., 5ft., and 6ft.

Answer 1

In your isosceles triangle create a right-angled triangle with a base of 3 and hypotenuse of 5

then cos(theta) = 3/5
theta = 53.13º