Question

7) A circular lawn is
uniformly 7 metres wide
and its inner edge is 440
metres. Calculate the
radius of the inner circle
and the area of the lawn.​

Answer 1

Answer:

The inner edge is 440 metres, hence the circle has a circumference of 440 m

Thence 2 x 22/7 R = 440 metres

R = (440/44) x 7 = 70 metres

The area of the lawn = 22/7 x ((77)^2 - (70)^2)

= 22/7 (5929 - 4900)

= 22/7 x 1029

= 3234 sq m

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