a gardener has to lay grass in a circa gardener has to lay grass in a circular ground,leaving the space 5m all around it.If the area of the ground with grass is 59400/21m² , find the area of ground without grass (use π =22/7)
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Answer:
Step-by-step explanation:
Correct option is
C
1021
7
3
sqm
Let radius of ground be R m.
Now, πr
2
=
21
59400
m
2
⇒r
2
=
21×22
59400×7
=900
⇒r=
900
=30m
∴ area of ground without grass =πR
2
−
21
59400
=π(30+5)
2
−
21
59400
=
7
22
×35×35−
21
59400
=3850−
21
59400
=
21
80850−59400
=
21
21450
=1021
7
3
m
2
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