There are many problems throughout the text
labeled IN YOUR OWN WORDS. Just relax; do
not be afraid to give your opinion. For the
most part, these questions do not have "right"
or "wrong" answers. You should spend about
five minutes in answering each of these questions.
See Figure 9.7
and definition of area; count the number of square centimeters
inside each figure. Some of these problems may require some
These problems are designed to help you estimate
areas. Don't be afraid to guess, check, and
then revise, if necessary.
The area of a rectangle is found by finding
the product of the length and the width. See
Examples 1 and 2.
The area of a parallelogram is calculated
by finding the product of the length and the
height. See Example 3.
The area of a triangle is found by multiplying
one-half times the base times the height.
See Example 4.
The area of a trapezoid is the product of
the height and the average of the lengths
of the bases. See Example 5.
The area of a circle is found by finding the
product pi times the square of the radius.
Note that if the diameter is given as in Problems
33-35, first find the radius (which is half
of the diameter). See Example 6.
First find the area of the circle (See Example
6), and then divide to determine the area
of the shaded portion.
In Problem 39, the area is the area
of a rectangle plus the area of half a circle.
In Problem 40, the area is the area
of a rectangle minus the area of half a circle.
Calculate the cost per square foot for each
lot and compare those prices to answer the
Choose the appropriate formula, substitute the given values, and find the requested
See Examples 7 and 8.
First find the area of the lawn, then find
the number of times that number is divisible
by 150 to enable you to calculate the cost.
Assume that you cannot purchase part of a
pound of lawn seed. See Example 7.
Since pizza's are circles, use Example 6 to
calculate the area of each pizza.
However, as you go through the book be
sure you look at all the examples in the text.
If you need hints for the Level 3 problems,
check some sources for help on the internet
(see the LINKS for that particular section.
As a last resort, you can call the author
at (707) 829-0606.
On the other hand, the problems designated
"Problem Solving" generally require techniques
that do not have textbook examples.
There are many sources for homework help
on the internet.
Ask Dr. Math
Here is a site where technology meets mathematics.
You can search a particular topic or choose
lessons, calculators, worksheets for extra
practice or other resources.
Dr. Math is a registered trademark. This is
an excellent site at which you can search
to see if your question has been previously
asked, or you can send your question directly
to Dr. Math to receive an answer.
This site provides online graphing calculators.
This is especially useful if you do not have
your own calculator.
The Math Forum @ Drexel
This site provides an internet mathematics
library that can help if you need extra help.
For additional homework help at this site,
click one of the links in the right-hand
Mathematics Home Page
Access the Clemens and Alcuins Library of
CSB/SJU and find one of the world's best collections
of mathematical internet sites.