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A square tank has its side equal to 40 m. There are four semi-circular grassy plots all around it. Find the cost of turfing the plot at Rs 1.25 per square meter.

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I would like to give a question which
i could not solve.Rd sharma class 10
maths exercise-15.4 mensuration.

In this question we have to find the cost
of turfing the plot at Rs 1.25 per square
meter given that a square tank has its side
equal to 40 m. There are four semi-circular
grassy plots all around it.

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1 Answer

  1. Given,

    Side of the square tank = 40 m

    And, the diameter of the semi-circular grassy plot = side of the square tank = 40 m

    Radius of the grassy plot = 40/2 = 20 m

    Then,

    The area of the four semi-circular grassy plots = 4 x ½ πr2

    = 4 x ½ (3.14)(20)2

    = 2512 m2

    Rate of turfing the plot = Rs 1.25 per m2

    So, the cost for 2512 m2 = (1.25 x 2512) = Rs 3140

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