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McGraw Hill Glencoe Geometry, 2012

MH

McGraw Hill Glencoe Geometry, 2012 View details

3. Areas of Circles and Sectors

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Exercise 1 Page 800

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

21 yd .

By substituting

21

for

r

in the formula, we can calculate

A .

A = π r^{2}

$r = 21$

A = π (21)^{2}

Calculate power

A = π (441)

Use a calculator

A = 1385.442360 \dots

Round to $1$ decimal place(s)

A \approx 1385.4

The area of the circle is approximately

1385.4

square yards.

Subchapter links

Check Your Understanding p.800

Practice and Problem Solving p.801-803

H.O.T. Problems p.803

Standardized Test Practice p.804

Spiral Review p.804

Skills Review p.804