Question

Find the cost of polishing a circular table-top of diameter 1.6 m, if
the rate of polishing is ₹15/m². (Take n=3.14)​

Answer 1

Given:

• Diameter of the table top = 1.6 m
• Rate of polishing per meter = ₹15

To Find:

Cost of polishing a circular table top.

Solution:

As per the question,

Diameter of the table top = 1.6 m

Radius = $\frac{1.6}{2}= 0.8m$

So,

Area = $3.14 \times 0.8 \times 0.8$

$:\implies \boxed {2.0096m^{2} }$

Now, finding the cost,

Rate of polishing per meter = ₹15

Cost for polishing $2.0096m^{2}$ area = 15 × 2.0096 = 30.14

Therefore,

$\boxed{Cost\: for \:polishing \: is \: Rs. 30.14}$

Answer 2

Given,

Daimeter=1.6 m

Radius=0.8 m

To find,

Cost

Solution,

Area of circle

$\pi \: {r}^{2}$

3.14×0.64=2.0096m²

Now,

Rate of the polishing per meter square=₹15

Cost of polishing table top=15×2.0096

Cost=30.14m²

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