math problem?

devincr

in triangle ABC, AB=BC. if the degree measure of angle B is b, which of the following represents the degree measure of angle a?

b

180-b

180-b/2

90-b

90-b/2

anonymous

90-b/2,

Angles A and C are equal and A+C+B=180 Then A+C=180-b.

A=C=a, 2a=180-b, a=90-b/2.

penya

It would be (180-b)/2.