JAMB Mathematics 2023 Objective — Question 20

Question 20 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2023 Objective paper, with the correct answer and a full explanation.

From the diagram (a triangle with an exterior angle of 110° and a base angle of 15°), find the value of x.

A. 30°
B. 15°
C. 40°Correct
D. 45°

Explanation

Using the isosceles triangle and angle sum properties: x+110°+30°=180°, so x=40°.

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