# In a quadrilateral ABCD, ∠ D is equal to 150° and ∠ A = ∠ B = ∠ C. Find ∠ A, ∠ B and ∠ C.

Given: Measure of ∠ D = 150° and ∠ A= ∠ B = ∠ C
To find: ∠ A, ∠ B, and ∠ C
Formula Used: Sum of angles of a quadrilateral = 360º
Let ∠ A= ∠ B = ∠ C = x°
Sum of the angles of the quadrilateral is 360°.
⇒ x° + x° + x° + 150° = 360°
⇒ 3x° + 150° = 360°
⇒ 3x° = 360° -150° = 210°
∴ x = = 70°
∠ A = 70°, ∠ B = 70° and ∠ C = 70°.

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