Question

A road which is 7m wide surrounds a circular park whose circumference is 88m. Find the cost of paving the road at the rate of rupees 60 per square meters.

Answer 1

circumference of a circle=2πr

2πr=88

r=88/2×7/22(π=22/7)

then r1= 14

r2=14+7

r2=21

area of a ring =π(r1^2-r2^2)

22/7×14×14-21×21

22×2×14-21×21

2616-441=2175

2175×60

₹130500.

Answer 2

Answer:

130500

Step-by-step explanation:

circumference of a circle=2πr

2πr=88

r=88/2×7/22(π=22/7)

then r1= 14

r2=14+7

r2=21

area of a ring =π(r1^2-r2^2)

22/7×14×14-21×21

22×2×14-21×21

2616-441=2175

2175×60

₹130500