A circular flower bed of radius 7m is in the middle of a rectangular lawn of area 600m². The area of the lawn, excluding the area of the flower bed, is .............
1 point
578m²
478m²
446m²
None
Q10. The radius of a circle with circumference 66m is ............
1 point
21m
10.5m
14m
None
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Step-by-step explanation:
area of rectangle - 600m^2
radius of circular flower bed - 7m
area of circle= π r^2
= 22/ 7 * (7 ) ^2
= 22*7
154m^2
excluding the area of the flower bed
600m^2 - 154 m^2
= 446m^2
Q. 10
circumference of circle = 2πr
66m = 2* 22/7 * r
66m= 44/7 * r
66*7/44 = r
= 10.5 m
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