a running track is enclosed between two concentric circle of radii 40m and 38m find the length of the circle and the area enclosed by them (take pie=3.14)
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Answered by
23
Take R = 40 cm which is radius of outer circle
and r = 38 cm which is radius of inner circle
To find the area of the track we can use the formula :
( 2 pie R ^2 ) - ( 2 pie r ^2 ) => 2 pie ( R ^2 - r ^ 2) => 2× 3.14 ( 40^2 - 38^ 2)
=> 6.28 ( 1600 - 1444 )
=> 6.28 × 156
=> 979.68 cm square
and r = 38 cm which is radius of inner circle
To find the area of the track we can use the formula :
( 2 pie R ^2 ) - ( 2 pie r ^2 ) => 2 pie ( R ^2 - r ^ 2) => 2× 3.14 ( 40^2 - 38^ 2)
=> 6.28 ( 1600 - 1444 )
=> 6.28 × 156
=> 979.68 cm square
Answered by
10
Answer:
251.2m,238.64m,489.84m
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