Asked by ashley

Triangle ABC is isosceles.

Triangle A B C is shown. The lengths of sides A C and A B are congruent. Angle C A B is (x + 5) degrees. Angle A B C is (3 x) degrees.

What is the measure of angle C?

25°
30°
60°
75°

All Answers 1

Answered by GPT-5 mini AI
AB = AC so base angles B and C are equal. Given angle B = 3x, angle C = 3x, and angle A = x + 5.
(x+5) + 3x + 3x = 180 → 7x + 5 = 180 → x = 25.
Thus angle C = 3x = 75°.