18. A circular park of radius 30 m has a track
of width 2.5 m on its inner side. Find the
area of the track. (
ᴘɪᴇ = 3.14)
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ANSWER:
We have radius of circular park =84/2m
=42m
area of circular park (A) =22/7×42
2
m
2
=5544/7m
2
radius of circle including the path and circular park = 42 + 8 m
=50m
area of the circle (a) =22/7×50
2
m
2
=55000/7m
2
therefore area of the path
=a−A
=5544/7−55000/7m
2
=(5544−55000)/7m
2
=2313.14286m
2
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