Question

The students of a Vidyalaya were asked to participate in a competition for making and
decorating penholders in the shape of a cylinder with a base, using cardboard. Each
penholder was to be of radius 3 cm and height 10.5 cm. The Vidyalaya was to supply
the competitors with cardboard. If there were 35 competitors, how much cardboard
was required to be bought for the competition?​

Answer 1

Step-by-step explanation:

Base of cylinder =3cm

so, radius 3/2

Height of cylinder= 10.5

CSA of cylinder= 2πrh

2×22/7× 3/2 ×105/100

990/100

so,9.9 cm

For 35competetiors = 35 × 9.9

346.5 cm^2 (ans)

Answer 2

Answer:

Answer

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