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McGraw Hill Glencoe Algebra 1, 2012

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McGraw Hill Glencoe Algebra 1, 2012 View details

8. Area

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Exercise 11 Page p28

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

$12.6 ft^{2}$

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

π .

A = π r^{2}

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

2 ft .

Let's substitute this value into the formula.

A = π r^{2}

$r = 2$

A = π (2)^{2}

Calculate power

A = π (4)

CommutativePropMult

Commutative Property of Multiplication

A = 4 π

Use a calculator

A = 12.56637 \dots

Round to $1$ decimal place(s)

A \approx 12.6

The area of the circle is approximately

12.6 ft^{2} .