Question

the students of a school were asked to prepare a pen holder of radius 3 cm and height 10.5 CM if shape of pen holder is cylindrical with circular base then find the area of cardboard needed to prepare 42 pen holder​

Answer 1

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