Math Help for Section 3.5, Page 137

Using
Formulas
In the geometric formulas in the box on page 137, A represents
area, P
represents perimeter, C
represents circumference, and
V
represents volume. Recall that the symbol $\pi $ represents the Greek
letter
pi. You can obtain an approximation of pi on a calculator by using the
following keystroke.

Keystroke	Display
	3.141592654

Study
Tip

When solving problems involving perimeter, area, or volume, be sure you
list the units of measurement in your answers.

Example
2: Check

    $\eqalign{100,000 &= 500\left( w
\right)&{\small\color{red}\quad\quad\text{Write original
equation.}} \cr 100,000 &\overset{?}{=} 500\left(
{\color{red}200} \right)&{\small\color{red}\quad\quad\text{Substitute 200 for }w.} \cr 100,000 &=
100,000&{\small\color{red}\quad\quad\text{Solution checks. }\checkmark} \cr} $