A racing track is bounded by two concentric circles with circumference 396 cm and 352 cm. find the area of the racing track
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Radius of the first concentric circle
= 396 cm
Let the radius be r
ATP
2πr = 396
= r = 396×7/22×1/2
= r = 63
Area of the first concentric circle
= πr^2
= 22/7×63×63 cm^2
= 12,474 cm^2
Radius of the second concentrate circle = 352 cm
Let the radius be r
ATP
2πr = 352
= r = 352×7/22×1/2
= r = 56
Area of the second concentric circle = πr^2
= 22/7×56×56 cm^2
= 9856 cm^2
Area of the racing track
= (12,474-9856) cm^2
= 2618 cm^2
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