151.The inner circumference of a circular track is 220 m. The track is 7 m wide everywhere. Calculate the cost of putting up a fence along the outer circle at the rate of Rs. 2 per metre.
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152.A field is in the form of a circle. The cost of ploughing the field at Rs. 1.50 per m2 is Rs. 5775. Find the cost of fencing the field at Rs. 8.50 per metre.
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153.Find the area of the shaded region in Fig. 12.72, where ABCD is a square of side 14 cm.
Fig. 12.72
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Long Answer Type
154.In figure, abc is a right angled triangle right-handed at A. Semi-circles are drawn on AB, AC and BC as diameter. Find the area of the shaded region.
Fig. 12.73
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Multiple Choice Questions
155.A chord of a circle of radius 14 cm subtends a right angle at the centre. What is the area of the minor sector?
Short Answer Type
Long Answer Type
Multiple Choice Questions
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