Question

A cylindrical container closed a one end has a diameter of 10 cm and height 15 cm. Find:
The value of the tin to the nearest naira if tin plate cost 1.25 naira per square centimeter

Answer 1

area of bottom = pi d^2/4 = 3.14 * 100 /4 = 25 * 3.14
area of side = pi d h = 3.14 * 10 * 15 = 150 * 3.14
so
total area = 175 * 3.14
cost = 1.25 * 175 * 3.14

Answer 2

A = pi*r^2+2pi*r*h = 3.14*5^2+6.28*5*15 = 549.8 cm^2.

Cost = 549.8 * 1.25 =