To find the value of each angle of the triangle use the property that the sum of the angles of a triangle is equal to 180 degrees.
As angle C is half as large as angle A and A = B, we can write the three angles of the triangle in terms of C as C, 2C and 2C.
C + 2C + 2C = 5C = 180
=> C = 36
A = 36*2 = 72 = B
The angles of the triangle are A = 72 degrees, B = 72 degrees and C = 36 degrees.
The sum of the three angles in a triangle add to 180 degrees. So if two of the angles are equal and the third is half as much as one, the developed equation is x+x+.5x=180. Combining like terms, 2.5x=180. Divide both sides by 2.5 and x=72. Angle A and B will be 72 degrees and angle C is 36 degrees.