A 7m wide road around a circular park whose circumference is 176 cm find the cost of fencing the outer boundary of the road at the 21 per meter
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Circumference of circle A = 2 π r
176 = 2 π r
176/2 = π r
88/π = r
R = (88/22) x 7
R = 4x7
R= 28 cm = 0.28 m
Circumference of circle B = 2 π r
Radius = radius of circle A + 7m
= 0.28 + 7
= 7.28 m
Circumference = 2 x 22/7 x 7.28
= 45.76 m
Cost of fencing 1m = Rs 21
Cost of fencing 45.76 m = Rs 21x 45.76
= Rs 960.96 ANS
176 = 2 π r
176/2 = π r
88/π = r
R = (88/22) x 7
R = 4x7
R= 28 cm = 0.28 m
Circumference of circle B = 2 π r
Radius = radius of circle A + 7m
= 0.28 + 7
= 7.28 m
Circumference = 2 x 22/7 x 7.28
= 45.76 m
Cost of fencing 1m = Rs 21
Cost of fencing 45.76 m = Rs 21x 45.76
= Rs 960.96 ANS
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