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
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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
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