Exercise 23 Page 596

We are given a circle and want to find its area.

The area of a circle with radius

r

is calculated using the formula below.

A = π r^{2}

From the figure we know that the radius of the circle is

3 inches .

By substituting

3

for

r

in the formula, we can calculate

A .

A = π r^{2}

$r = 3$

A = π (3)^{2}

Calculate power

A = π (9)

Use a calculator

A = 28.274334 \dots

Round to $1$ decimal place(s)

A \approx 28.3

The area of the circle is approximately

28.3

square inches.