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प्रश्न
Find the area of a circular pathway whose outer radius is 32 cm and inner radius is 18 cm.
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उत्तर
Radius of the outer circle R = 32 cm
Radius of the inner circle r = 18 cm
Area of the circular pathway = π(R2 – r2) sq.units
= `22/7 (32^2 - 18^2) "cm"^2`
= `22/7 xx (32 + 18) xx (32 - 18) "cm"^2`
= `22/7 xx 50 xx 14 "cm"^2`
= 2,200 cm2
Area of the circular pathway = 2,200 cm2
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