Posted by Lori on .
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.

PreCalc 
Reiny,
In your isosceles triangle create a rightangled triangle with a base of 3 and hypotenuse of 5
then cos(theta) = 3/5
theta = 53.13ยบ