JAMB Mathematics 2021 Objective — Question 39

Question 39 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

39. [See diagram] In the figure above, the value of x is (a) 120° (b) 220° (c) 140° (d) 110°

A. 120°
B. 220°
C. 140°Correct
D. 110°

Explanation

The exterior angle of a triangle equals the sum of the two opposite interior angles, so x° = 20° + 80° + 40° = 140°.

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