Question

Find angle A if angle A + angle b is equal 100 and angle C + angle A is equal to 120

Answer 1

Answer:

Step-by-step explanation:

∠A+∠B = 100°

⇒∠A = 100°-∠B

∠C+∠A = 120°

⇒∠A = 120°-∠C

⇒ 120° - ∠C = 100°-∠B

⇒∠B-∠C = 100°-120°

⇒∠B-∠C = -20°

⇒∠C-∠B = 20°