McGraw Hill Integrated II, 2012
MH
McGraw Hill Integrated II, 2012 View details
2. Surface Areas of Prisms and Cylinders
Continue to next subchapter

Exercise 24 Page 819

Use the formula for the lateral area of a prism.

h = 4 in

Practice makes perfect

We are asked to find the height of the given prism.

The lateral area L of a prism is the sum of the areas of the lateral faces. Let's recall the formula for the lateral area of a prism. L=Ph In this formula, P is the perimeter of the base and h the height of the prism. We will start by finding the perimeter of the base. In the diagram, we see that the base is a rectangle with length 5in and width 1in. Its perimeter is twice the sum of these two numbers. P=2( 5+ 1) ⇔ P= 12in We also know that the lateral area of the solid is 48in^2. With this information, we can find the height of the prism.
L=Ph
48= 12(h)
48/12=h
4 = h
h=4
We found that the height of the prism is 4 in.