Помогите! Геометрия 8 класс.

1) ∠M = ∠R = 140 / 2 = 70°
∠P = ∠N = 180 - 70 = 110°

2)∠B = A + 60
∠A + ∠B = ∠A +∠A + 60 = 180
∠A = (180 - 60) / 2 = 120 / 2 = 60°
∠C = ∠A = 60°
∠B = ∠D = A + 60 = 60 + 60 = 120°

3) ∠S = 2X
∠L = X
∠S + ∠L = 180
2X + X = 180
X = 180 / 3 = 60
∠S = ∠M = 2X = 2 * 60 = 120°
∠R = ∠L = X = 60°

4) ∠M = 90°
∠K = 180 - ∠M = 180 - 90 = 90°
∠M = ∠K = ∠R = ∠N = 90°