It is given in the question that, Diameter of table cover = 1.5 m &there4; The radius of circular cover = 1.5/2 We know that, Circumference of the circle = 2πr &there4; Circumference = 2 × 3.14 × = 3.14 × 1.5 = 4.71 m Also, it is given in the question that: Cost of 1 m of lace = Rs 15 &there4; Cost of 4.71 m of lace = 4.71 × 15 = Rs 70.65

Q. 64.5( 146 Votes )

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Class 7th NCERT Mathematics 11. Perimeter and Area

Answer :

It is given in the question that,

Diameter of table cover = 1.5 m

∴ The radius of circular cover = 1.5/2

We know that,

Circumference of the circle = 2πr

∴ Circumference = 2 × 3.14 ×

= 3.14 × 1.5

= 4.71 m

Also, it is given in the question that:

Cost of 1 m of lace = Rs 15

∴ Cost of 4.71 m of lace = 4.71 × 15

= Rs 70.65

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