Question

the diameter of a circular glass frame is 84 cm.A 2cm wide metallic border is outside it. find the cost of metal requiered for bordering the glass frame at Rs.30 per sq.cm

Answer 1

Answer:

Rs. 8007

Step-by-step explanation:

There are two steps to solve this problem

find the area of the glass with 2 cm border

find the area of the glass

Subtract the two to get area of the metal portion

Diameter of glass with border = 86 cm

Area = pi*(d^2/4)

=3.14 *86*86 / 4

5805.86sq. cms.

Diameter of glass is 84 cms

Area of glass is

Area = pi*(d^2/4)

=3.14 *84*84 / 4

= 5538.96

5805.86- 5538.96 = 266.9sq. cms is the area of the metal.

The cost will be 266.9* 30 = Rs. 8007