Question

32.Find the cost of polishing a circular table top of diameter of 2m. If the rate of polishing is RS
15/sqm. (r =3.14)​

Answer 1

Before, finding the answer. Let's find out on how we can find the answer.

• First, we must find the Radius of the Circular Table by dividing the diameter by 2.
• Next, we must find the Area of Circle by using the formula of :

$\boxed{ \sf Area \: of \: Circle = \pi {r}^{2} }$

Where,

• π = 3.14

Here, we must first multiply 3.14 and radius twice.

• At last we must multiply Rate and Area.

____________________

Given :

• Diameter = 2 m
• Rate = Rs. 15

To find :

• Rate of Polishing

Solution :

Diameter of Circle = radius × 2

Radius = Diameter/2

$= \dfrac{2}{2}$

$\sf = 1 \: m$

Hence, Radius is 1 m.

Area of Circle = πr²

= 3.14 × 1 × 1

= 3.14 × 1

= 3.14 m²

Hence, the Area of Circle si 3.14 m².

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Cost for Polishing = Area × Rate

= 125 × 15

= Rs. 1875

Hence, Cost for Polishing is Rs. 1875.