Page 24 - PPT 6

Example:

 One of the two equal angles of an isosceles

triangle measures 40º. Find all the angles of the

triangle.

Solution: The sum of two angles of the triangle =

40º +40º = 80º (because two sides of an

isosceles triangle is same)

Sum of the all the angles = 180º

So, the third side = 180º - 80º =100º