Answer:
∠a = 35
∠b = 40
∠c = 35
∠d = 70
Explanation:
∠b = 40 {Vertical angles are congruent}
∠d = 70 {Vertical angles are congruent}
∠1 = ∠ a
∠2 = ∠c
∠1 = ∠2
So, ∠1 =∠2 = ∠a = ∠c
70 + 40 + ∠a + ∠2 = 180 {Straight line angle}
110 + 2∠a = 180 {∠a =∠2}
2∠a = 180 - 110
∠a = 70/2
∠a = 35
∠1 =∠2 = ∠a = ∠c = 35
e) When we add all the angles, we get 360.