Question

In a SUPW cass, 20 students made pen stands of cardboard. 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 cardboard was used by each. How much glazed paper is used on its outer curved surface? Also find the total cardboard and glazed paper used by the class

Answer 1

Answer:

FOR 20 pen holders you can multiply answer with 20..

Step-by-step explanation:

539 is ans with area of base

500.5 is answer without base

real ans is 539

Ans for 20 pen holders is

539 * 20 = 10780

THANK YOU...

Answer 2

Cardboard was used by each student=$269.5 cm^2$

Glazed paper is used on its curved surface =$231cm^2$

Total cardboard used by class=$5390 cm^2$

Total glazed paper used by the class=$4620cm^2$

Step-by-step explanation:

Radius of base=r=3.5 cm

Height of pen stand=h=10.5 cm

Cardboard was used by each student=$2\pi rh+\pi r^2=\pir(2h+r)$

$\pi=\frac{22}{7}$

Substitute the values then we get

Cardboard was used by each student=$\frac{22}{7}\times 3.5(2\times 10.5+3.5)$

Cardboard was used by each student=$269.5 cm^2$

Glazed paper is used on its curved surface =$2\pi rh=2\times \frac{22}{7}\times 3.5\times 10.5=231cm^2$

Glazed paper is used on its curved surface =$231cm^2$

Total cardboard used by class=$20\times 269.5=5390cm^2$

Total glazed paper used by the class=$231\times 20=4620cm^2$

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https://brainly.in/question/88509:Answered by kaushikravikant