Question

one base angle of an isosceles triangle ABC is 65 degree. find the vertical angle

Answer 1

base angles are equal.
so angle B= angle C
if angle B is 65 degree then angle C is same
vertical angle=x
=65+65+x=180
=x=180-130
=x=50 degree

Answer 2

Step-by-step explanation:

base angles are equal

then angle B = angle C

We know that sum of angles of triangle = 180'

so the vertical angle = 65 +65+x = 180'

130' + x =180'

x = 180-130

x = 50'