Question

find the cost of polishing the top of a circular table of diameter 4.2m, if the rate of polishing is rs 12 per sq.m

Answer 1

Solutions :-

Given :
The top of a circular table of diameter 4.2 m
Radius = r = 4.2/2 = 2.1 m

Find the area of top of a circular table :-

Area of circle = πr² sq. units
= 22/7 × 2.1 × 2.1 m²
= 22/7 × 4.41 m²
= 13.86 m²

Find the cost of polishing the top of a circular table :-

1 m² = Rs 12
1.26 m² = Rs (12 × 13.86) = Rs 166.32

Hence,
The cost of polishing the top of a circular table = Rs 166.32

Answer 2

$\underline{\underline{\Huge\mathfrak{Answer ;}}}$

Dear ,

Your answer is ; ₹ 166.32

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Step by Step Explanation ;-
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Given ;-
• Diameter (d) of the top of a Circular table = 4.2 m.
• Radius (r) = 4.2 ÷ 2 = 2.1 m.

Now ,
Finding the area of the top of a circular table ;-

We know that ;-
Area of circle = pi r^2 sq. units.

So ,
$= > \frac{22}{7} \times 2.1 \times 2.1m^{2}$
$= > \frac{22}{7} \times 4.41m^{2}$
$= > 13.86m^{2}$

Now ,
Finding the cost of polishing the top of a circular table ;-

$1m^{2} = rs \: 12$
So ,

$1.26m^{2} = 12 \times 13.86 = rs \: 166.32$

Therefore ,
The cost of polishing the top of a circular table is ₹ 166.32



__________________________

- Regards
@ItsDmohit