Question

10. The internal circumference of a circular track is 88 m. If the track is 1.4m wide, find the circumference of the outer edge, hence find the cost of fencing the outer circumference at the rate Rs 10 per metre.
Ans- 96.8 met, 968 rs

Answer 1

Answer:

Step-by-step explanation:

Internal circumference=88m

88=2πr

88=2 X 22/7 X r

88 X 7/2 X 22=r

Inner radius=14m

Outer radius=14+1.4=15.4m

C=2 X 22/7 X 15.4 (outer)

C=96.8m (outer circumference)

Cost of fencing 1 meter=₹10

Cost of fencing 96.8m=96.8 X 10

=₹968

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Answer 2

Answer:

*outer circumference* =96.8m

cost of fencing= rs968

Step-by-step explanation:

Internal circumference of the circular track=88m

2πr= 88 m

2×22/7×r= 88m

r=14m

internal edge/radius =14m

so, outer edge = 14m+ 1.4m (given width of the track= 1.4) = 15.4

Outer Circumference= 2πr

2×22/7×15.4

=96.8m

Hence, the outer circumference is 96.8 m

Cost of fencing= 96.8 × 10rs

= rs968

Hence, the cost of fencing the outer circumference is rs 968.

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