Question

Find the Cost of polishing a circular table top of diameter whose radius is 1.4m at the cost of Rs. 100 per m sq.

Answer 1

Step-by-step explanation:

Given that the diameter of the circular table top is 4 m.

To find out: Cost of polishing the top of the table at Rs. 25 per m

2

.

Radius of the table (r)=

2

d

=

2

4

=2 m.

We know that, area of a circle =πr

2

∴ area of the table top =3.14×2×2[∵ π=3.14]

∴ Area =12.56 m

2

Now, cost of polishing 1 m

2

area =Rs. 25.

∴ Cost of polishing 12.56 m

2

area will be:

12.56×25=Rs. 314

Hence, the cost of polishing the circular table top of diameter 4 m is Rs. 314.