Question

A road 3.5m wide surrounds a circular plot whose circumference is 44 m. Find the cost of paving the road at rupees 20 per metre square.​

Answer 1

circumference of circular plot = 44 m

2πr = 44 m

2×22/7×r = 44 m

r = 7 m

area of path =area of outer circle - area of inner circle

area of path = π × 10.5² - π × 7²

= π × ( 10.5²-7²)

= π × (110.25 - 49)

= π × 61.25

= 22/7 × 61.25

= 192.5 m²

cost of paving the path 1 m² = rs 20

cost of paving the path 192.5 m²= 192.5×20

= rs 3850

so, the cost of paving the path 192.5 m²= rs 3850

Answer 2

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