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McGraw Hill Glencoe Algebra 1, 2012

MH

McGraw Hill Glencoe Algebra 1, 2012 View details

8. Area

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Exercise 15 Page p28

The area of a circle is the product of the radius squared and $π .$

$201.1 in^{2}$

The area of a circle is the product of the radius squared and

π .

A = π r^{2}

We are given that the diameter of a circle is

16 inches,

so the radius is

8 inches .

Let's substitute this value into the formula.

A = π r^{2}

$r = 8$

A = π (8)^{2}

Calculate power

A = π (64)

CommutativePropMult

Commutative Property of Multiplication

A = 64 π

Use a calculator

A = 201.06192 \dots

Round to $1$ decimal place(s)

A = 201.1 in^{2}

The area of the circle is approximately

201.1 in^{2} .