Question

ABC is an isosceles triangle withAB=AC.If <A=55°,find <C

Answer 1

Given

ABC is an isosceles triangle
AB=AC
Angle A=55

To find
Angle C

Solution

Angle A=Angle C Because angles opposite to equal sides are also equal

Thus Angle C =55

Answer 2

Since AB =AC therefore the opposite angles are also equal... So let us take this unknown angles be x.
Now, by angle sum property of triangle
A +B+C =180
55+x+x =180
2x = 180-55
X =125/2
I. E x =62.5