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12. Areas Related to Circles
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Q14 of 35 Page 230

Tick the correct answer in the following:

Area of a sector of angle p (in degrees) of a circle with radius R is


A.


B.


C.


D.

Area of sector of angle θ = * R2

So,


Area of sector of angle p = (R2)


= ()(2R2)


Hence, (D) is the correct answer


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12

To warn ships for underwater rocks, a lighthouse spreads a red colored light over a sector of angle80° to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use π = 3.14)

13

A round table cover has six equal designs as shown in Fig. 12.14. If the radius of the cover is 28 cm, find the cost of making the designs at the rate of Rs 0.35 per cm2. (Use = 1.7)

1

Find the area of the shaded region in Fig. 12.19, if PQ = 24 cm, PR = 7 cm and O is the centre of the circle.

2

Find the area of the shaded region in Fig. 12.20, if radii of the two concentric circles with centre O are 7 cm and 14 cm respectively and ∠ AOC = 40°.

Questions · 35
12. Areas Related to Circles
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