If ∠1 and ∠2 are consecutive interior angles for parallel lines, and ∠1 = (3x + 20)°, ∠2 = (x + 40)°, find x.

Type: MCQ • Marks: 1

A. 25°

B. 20°

C. 40°

D. 30°

Explanation

Sum = 180° => 3x + 20 + x + 40 = 180 => 4x + 60 = 180 => 4x = 120 => x = 30°.

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Class 7th Ganita Prakash 1

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