Question

A school organised a competition of making and decorating pen holders in the shape of a cylinder by making its base and its curved surface area with cardboard. Each pen holder is supposed to have a radius of 3.5 cm and height 10 cm. How much cardboard does the school need if 30 students are participating in the competition?

Answer 1

Answer:

Step-by-step explanation:

radius = 3.5cm

height = 10

students participating = 30

area of 1 pen holder = 2×πrh+πrr

=2 × 22 ÷ 7 × 3.5 × 3.5 × 10 +

22 ÷ 7 × 3.5 × 3.5

=258.5cm