7. Mrs Sulekha wants to make a circular grass bed
in her garden. If the cost of levelling the ground
is 18 per sq. m, find the amount she has to spend
to make a circular grassbed of diameter 7 m
22
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area of circular bed = π r square
22÷7 × 3.5 × 3.5
22× 0.5 × 3.5
= 22× 1.75
38.5
area = 38.5
leveling the ground = 38.5 × 18 = 693
Therefore 693 are needed for leveling the ground .
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