Question

I don’t know how to start it.

Answer 1

36°

Explanation:

∠A + ∠B + ∠C = 180°

∠A:∠B:∠C = 8:10:12 = 8x:10x:12x

8x + 10x + 12x = 180

20x = 180

x = 9

∠A = 8x = 8 × 9 = 72°

∠B = 10x = 10 × 9 = 90°

∠C = 12x = 12 × 9 = 108°

∠C - ∠A = 108 -72 = 36 °

The difference between the largest and the smallest angle is 36°.