In a triangle the sides are 4 cm, 5 cm and 4 cm. One of the base angle is 80 . Find the measure of the apex angel.

In a triangle the sides are 4 cm, 5 cm and 4 cm. One of the base angle

1.	In a triangle the sides are 4 cm, 5 cm and 4 cm. One of the base angle is 80 . Find the measure of the apex angel.
A.	30
B.	40
C.	20
D.	10
Answer» D. 10