Question

the diameter of a circular-table is 80 cm, find the drcumference. Also, find the cost of covering the
boundary with a ribbon at the rate of Rs. 3 per em: Take n= 22/7thint: C= 214R]
​

Answer 1

Step-by-step explanation:

diameter=80 cm

radius=80/2=40 cm

circumference=2πr

=2*22/7*40

=1760/7=251.42 cm

cost of covering for 1 cm=RS.3

cost of covering 251.42 cm=3*251.42.=754.26rs.

Answer 2

GIVEN THAT

Diameter of the circular table = 80 cm

Cost of covering the boundary of the

circular table per metre = rs 3

TO FIND

Total cost of covering the boundary

of the circular table by the ribbon.

FORMULA USED

Circumference of circle = 2 × π × r

SOLUTION

Radius of the circular table = D / 2

➡️ 80

2

➡️ 40 cm

So, radius of the circular table is 40 cm

Circumference of the table = 2 × π × r

➡️ 2 × 22 × 40

7

➡️ 251.42 cm

So, circumference of table is 251.42 cm

NOW,

Total cost of covering the boundary =

➡️ rs ( 251.42 × 3)

➡️ rs 754.28

So, total cost of covering the boundary of the circular table by ribbon = rs 754.28