Question

In a SUPW class, 20 student made pen stand of cupboard. the base of the pen stand is a circle with radius 3.5 cm and height of the pen stand is 10.5 cm .find how much cupboard was used by each. how much glazed paper is used on its outer surface also find the total cupboard and glazed paper used by the whole class .​

Answer 1

Answer:

see the attachment......

Answer 2

Answer:

Cardboard used = 2141.78cm²

Glazed paper used = 618cm²

Step-by-step explanation:

pen stand is a cylinder with

• radius=3.5
• height =10.5cm

We need to find,

• its total surface area for cardboard used.
• lateral surface area for glazed paper used.

$total \: surface \: area \: of \: cylinder = \\ 2\pi rh + 2\pi {r}^{2}$

$(2 \times \frac{22}{7} \times 3.5 \times 10.5) + 2 \times \frac{22}{7} \times {3.5}^{2}$

30.90+76.96=107.86

20 Students = 107.86×20

=2141.78cm²

$lateral \: surface \: area \: of \: cylinder = \\ 2\pi rh$

$(2 \times \frac{22}{7} \times 3.5 \times 10.5)$

= 30.90

20 Students = 30.90×20

= 618cm²