Question

Find the cost of polishing of a circular table top of diameter 1.6 m if the rate of polishing

is rupees 15 per meter square.​

Answer 1

Answer:

Rs 30.15

Step-by-step explanation:

Radius of table = diameter/2 = 1.6/2

                         = 0.8 m

Area of the table = πr²

                             = (22/7) (0.8 m)²  [π = 22/7]

                             = 2.01 m²

Cost = Rate x area

        = Rs 15 x 2.01

        = Rs 30.15

Answer 2

Given :-

Diameter = 1.6 m

Rate = Rs. 15

To Find :-

Total cost

Solution :-

At first finding radius of the table

Radius = Diameter/2

Radius = 1.6/2

Radius = 16/20

Radius = 8/10

Radius = 0.8 m

Now

Area of table =  πr²

Area = 22/7 x 0.8  x 0.8

Area = 22/7 x 0.64

Area = 2 m

Cost = Rate x Area

Cost = 15 x 2

Cost = Rs.30