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Beomgyu wants to lace the edge of a 2 m diameter circular tablecloth. What is the cost of the required lace length if one metre of lace costs $10?

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$ 62.8

$ 72.8

$ 82.8

$ 92.8

answer is A.

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Detailed Solution

Given,

Diameter of the circular table = 2 m.

Radius, r = $\frac{diameter}{2}$ = $\frac{2}{2}$ = 1 m.

Circumference of the circle = 2πr.

= 2 × 3.14 × 1 = 6.28 m

The required length of lace is 6.28 m.

Cost of 1 m lace = $ 10.

Cost of 6.28 m lace = $ 10 × 6.28 = $ 62.8.

Therefore, the cost of the required lace length is $ 62.8.

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