Question

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answer those questions7and8those
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Answer 1

Answer:

Q7)

Diameter of the circular table top = 1.6 m

Radius of the circular table top =1.6/2 =0.8

Area of circular table top = π r 2 = 3.14 x 0.8 x 0.8 = 2.0096 m2

Now cost of 1 m2 polishing = Rs 15

Then cost of 2.0096 m2 polishing = 15 x 2.0096 = Rs 30.14 (approx.)

Thus, the cost of polishing a circular table top is Rs 30.14 (approx.)

Q8)

Length (l) of cardboard = 8 cm

Breadth (b) of cardboard = 5 cm

Area of cardboard including margin = l × b = 8 × 5 = 40 cm2

From the figure, it can be observed that the new length and breadth of the cardboard, when margin is not included, are 5 cm and 2 cm respectively.

Area of the cardboard not including the margin = 5 × 2 = 10 cm2

Area of the margin = Area of cardboard including the margin − Area of cardboard not

including the margin

= 40 − 10 = 30 cm2

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Answer 2

Answer:

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