Question

The students of vidhyalaya were asked to participate in a competition for making and decorating pen holders in the shape of a cylinder with a base using a cardboard. Each pen holder was to be radius 3cm and height 10.5cm. The vidhyalaya was to supply the competitors with cardboard. If there's were 35 competitors how much cardboard was required to be brought for the competition?

Answer 1

CSA of a cylinder +area of bottom circle
2πrh+πr²
[(2×22/7×3×10.5)+22/7×3×3]cm
(198+28.28)cm²
226.28cm²approx
cardboard required for 35 competitors
(35×226.28)cm²
7920cm²approx