What is the measure of each vertex angle of an isosceles triangle if it's base angle measures 18?

Question

I need help on this problem because I don't understand & I just want the answer 

Answer 1

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 a  /_________\b

 

The base angles a, and b will be equal

in an isosceles triangle:

Angle a and angle b are both 18 degrees.

 

The angles of a triangle add up to 180 degrees

a + b + c = 180

18 + 18 + c = 180

36 + c = 180

c = 144

 

Your three angles are 18 degrees, 18 degrees, and 144 degrees