The cost of fencing a circular garden of radius 21 m at x 10 per metre isa - 1320b - 132c 1200d - 660

Radius (r) = 21 m Cost per metre = ₹10 Circumference of circle = 2 #960;r=2 #215;227 #215;21=132 #160;m Cost of fencing = Circumference #215; Cost pe ...

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Standard VII

Mathematics

Perimeter of Square and Rectangle

The cost of f...

Question

The cost of fencing a circular garden of radius 21 m at ₹10 per metre is

(a) ₹1320 (b) ₹132 (c) ₹1200 (d) ₹660

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Solution

Radius (r) = 21 m
Cost per metre = ₹10
Circumference of circle = $2 π r = 2 \times \frac{22}{7} \times 21 = 132 m$
Cost of fencing = Circumference $×$ Cost per metre
= 132 $×$ ₹10
= ₹1320
Hence, the correct option is (a).

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The cost of fencing a circular garden of radius 21 m at ₹10 per metre is (a) ₹1320 (b) ₹132 (c) ₹1200 (d) ₹660

Radius (r) = 21 m Cost per metre = ₹10 Circumference of circle = 2πr=2×227×21=132 m Cost of fencing = Circumference × Cost per metre = 132 × ₹10 = ₹1320 Hence, the correct option is (a).

The cost of fencing a circular garden of radius 21 m at ₹10 per metre is

(a) ₹1320 (b) ₹132 (c) ₹1200 (d) ₹660

Radius (r) = 21 m
Cost per metre = ₹10
Circumference of circle = $2 π r = 2 \times \frac{22}{7} \times 21 = 132 m$
Cost of fencing = Circumference $×$ Cost per metre
= 132 $×$ ₹10
= ₹1320
Hence, the correct option is (a).