Question

Find the cost of polishing a circular table of diameter 42 cm, if the rate of polishing is ₹ 20 per metre square.

Answer 1

Answer:

cost of polishing is =27,720 Rupees

Step-by-step explanation:

According to the information provided in the question it is given as

Circular table of diameter =42 cm

Rate of polishing =₹ 20 per metre square.

We need to find the cost of polishing

First the diameter is =42 cm

Hence the radius = D/2

Putting the value

 =42 /2

=21$m^{2}$

Now we find the area of circular table top

Area =$\pi r^{2}$

$A=\frac{22}{7}\times 21^{2}$

$A=\frac{22}{7} \times 21\times21\\A=22\times 3\times 21$

$A=1386m^{2}$

Now

Cost of polishing = Area of circular top x rate per square meter

Putting the value we get the answer

$Cost of polishing =1386 \times 20\\ C=27,720 rupees$

So cost of polishing is =27,720 Rupees

Answer 2

QUESTION :-

• Find the cost of polishing a circular table of diameter 42 cm, if the rate of polishing is ₹ 20 per metre square.

GIVEN :-

• cost of polishing a circular table of diameter 42 cm

• if the rate of polishing is ₹ 20 per metre square.

TO FIND :-

• Find the cost of polishing = ?

SOLUTION :-

Radius = 21 m

Area = πr² = 22/7 × 21 × 21 = 1386m²

1 m² = ₹ 20

1386m² = ₹ 20 × 1386m²

= ₹ 27,720

cost of polishing a circular table

= ₹ 27,720