Question

B
18. In
a quadrilateral ABCD, angle D is equal to 150° and angle A = angle B = angle C. Find angle A,B and C.​

Answer 1

Answer:

since 3 angles are equal then

Step-by-step explanation:

∠D = 150°

Let∠A =∠B =∠C = x

By angle sum property of quadrilateral,

∠A + ∠B + ∠C +∠D = 360°

x + x +x+∠D = 360°

3x+∠D = 360°

3x = 360°–∠D

30 = 360° – 150°

3x = 210°

x = 70°

Hence,∠A =∠B =∠C = 70°.

Thanks

hope it helps you