Mathematics Past Questions | JAMB, WAEC, NECO and Post UTME Past Questions

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A circle with a radius 5cm has its radius increasing at the rate of 0.2cm/s. What will be the corresponding increase in the area?

\(3\pi \)

\(4\pi \)

\(2\pi \)

\(5\pi \)

A circle of perimeter 28cm is opened to form a square. What is the maximum possible area of the square?

56 \(cm^{2} \)

98 \(cm^{2} \)

49 \(cm^{2} \)

28 \(cm^{2} \)

A circular arc subtends angle 150° at the centre of a circle of radius 12cm. Calculate the area of the sector of the arc.

\(30 \pi cm^{2} \)

\(60 \pi cm^{2} \)

\(120 \pi cm^{2} \)

\(150 \pi cm^{2} \)