The students of a school were asked to participate in a competition for making pen-
holders in the shape of cylinder with a base, using cardboard. Each pen-holder was to
be of radius 3 cm and height 10.5 cm. the school was to supply the competitors with
cardboard. If there were 70 competitors, how much cardboard is require
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sorry yar i need point plz
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Answer:
here the pen holder is open at top,but covered at the bottom.
Step-by-step explanation:
Surface area of 1 penholder=Curved surface area of cylinder with+Area of bottom circle with radius3 cm
RADIUS(r) of the circular end of cylindrical penholder=3cm
HEIGHT(h) of penholder=10•5cm
surface area of 1 penholder=curved area of cylinder with+Area of circle with radius3 cm
2πrh+πr2
(2×22/7×3×10•5+22/7×[3])cm2sq
=(22/7[2×3×10•5+{3}2]cm2
=(22/7{63+9}cm2
=(22/7[72])cm2
area of cardboard required=surface area of 35 penholder
=35×(22/7×72)cm2
5×(22×72)cm2
=7920
THEREFORE,7920cm CARDBOARD SHEET WILL BE BROUGHT.....
HOPE YOU UNDERSTAND
PLS MARK ME BRILLIANTIES....
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