Question

What is the measure of the vertex angle of an isosceles triangle if one measure 65 degrees and its congruent sides are 15cm each?
A:50
B:60
C:30
D:40

Answer 1

I believe the answer is A 

Answer 2

Hello, to answer your question in depth and properly

The answer is A
since base angles of an isosceles triangle are congruent the other base angle is also 65. since the three angles together sum to 180 thst leaves 180-65-65=180-130 = 50 degrees for the vertex angle 


          Signed by, Virtuso Sargedog