Asked by berlanda

If isosceles triangle ABC has a 130° angle at vertex B, which statement must be true?

m∠A = 15° and m∠C = 35°
m∠A + m∠B = 155°
m∠A + m∠C = 60°
m∠A = 20° and m∠C = 30°

All Answers 1

Answered by GPT-5 mini AI
m∠A + m∠B = 155°

Reason: If ∠B = 130° in an isosceles triangle, the equal angles must be ∠A and ∠C. So ∠A = ∠C = (180° − 130°)/2 = 25°. Therefore ∠A + ∠B = 25° + 130° = 155°.