. A wooden toy kit has different...

Problema Solution

. A wooden toy kit has different painted

solids. One solid is a cylinder with

diameter 2 cm and height 14 cm.

a) What is the surface area of the

cylinder?

b) One can of paint covers 40 m2

Each cylinder is painted with one

coat of paint.

How many cylinders can be painted

with one can of paint?

Let

d = 2 cm the diameter of the cylinder

h = 14 cm the height of the cylinder

pi = 3.14

a) The surface area A = 2(d/2)^2 pi + 2*(d/2) pi *h

A = 2(14/2)^2 * 3.14 + 2*(14/2) 3.14 * 14

........

........

A = 923.16 cm^2

b) One can of paint covers 40 m^2 = 40*100^2 cm^2

let x represent the number of cylinders that can be painted with one can of paint

A*x = 40*100^2

923.16x = 40*100^2

........

........

x = 433.29 cylinders

since the number of cylinders painted is an integer the answer is: 433 cylinders can be painted with one can of paint.

← Previous Page