**What is the radius of a circle if its perimeter is numerically equal to thrice its area?**A. 2B. 3C. 2/3D. 4**The area of the sector of a circle, whose radius is 12 metres when the angle at the centre is 60, is**A. 13.2 m^{2}B. 75.42 m^{2}C. 13.4 m^{2}D. None of these**Find the radius of the circle if area of sector is 924cm2 and angle at the center is 60.**A. 42B. 21C. 22D. 46**The difference between the circumference and area of a circle is 110 metres. Find its circumference.**A. 44mB. 84mC. 30mD. 7m**When the radius of a circle is decreased by 100%, the area of the circle:**A. decreases by 50%B. decreases by 100%C. increases by 100%D. decreases by 200%

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**Find circumference of a circle if area of the circle is 154 cm**^{2}.A. 18B. 22C. 44D. 66**The difference between the circumference and the diameter of the circle is 60 cm. The area of the circle is:**A. 425 cm2B. 616C. 154cm^{2}D. 308 cm^{2}**The circle is 21 cm and m (arc RYS) = 60°. Find the area of the sector.**

A. 38.5 cm^{2}B. 231 cm^{2}C. 25.66 cm^{2}D. 6.42 cm^{2}**A regular hexagon is inscribed in a circle of radius 10 cm. Find the area of the shaded portion. (× ≈ 3.14 ; √3 ≈ 1.73).**

A. 271 cm^{2}B. 54.5 cm^{2}C. 290 cm^{2}D. 75 cm^{2}**The radius of a circle is decreased by 40%. What will be the percentage decrease in its surface area?**A. 64%B. 36%C. 20%D. 10%