JAMB Mathematics 2021 Objective — Question 4

Question 4 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

4. The circumference of a circle is 100cm, what is the area of the circle? (a) 142cm² (b) 795cm² (c) 830cm² (d) 419cm²

A. 142cm²
B. 795cm²Correct
C. 830cm²
D. 419cm²

Explanation

C = 2πr, so 100 = 2 × 22/7 × r, giving r = 175/11 cm. Area = πr² = 22/7 × (175/11)² ≈ 795.45cm².

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