1.

The radius of a circular cricket ground is 60 around the ground a 7 M circular gallery is to be build for spector. What will be its area​

Answer»

To FIND :
The area of gallery for Spectator's
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Solution :


RADIUS of bigger circle = 60 + 7 = 67 cm
Area = 22/7 * (67)²
Area = 22/7 * (4489)
Area = 14108.28 cm²



Area = 22/7 * (60)²
Area = 22/7 * (3600)
Area = 11314.28 cm²


Now,
Area of gallery = Area of bigger circle - Area of smaller circle
Area of gallery = 14108.28 - 11314.28
Area of gallery = 2794 cm²


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