Question

The students of a school were asked to participate in a competition for making pen-
holders in the shape of cylinder with a base, using cardboard. Each pen-holder was to
be of radius 3 cm and height 10.5 cm. the school was to supply the competitors with
cardboard. If there were 70 competitors, how much cardboard is required​

Answer 1

Answer:

the cardboard required is =7920cm^2

Step-by-step explanation:

Given:

R=3cm, H=10.5cm

⇒Surface area = Curved Surface Area + Base Area

=2πrh+πr

2

=2×

7

22

×3×

10

10.5

+

7

22

×3×3cm

2

=198+

7

198

cm

2

=

7

1584

cm

2

⇒Area of cardboard sheet used by competitor =

7

1584

cm

2

⇒Area of cardboard sheet used by 35 competitors =

7

1584

×35

=7920cm^2