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McGraw Hill Glencoe Algebra 1, 2012

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McGraw Hill Glencoe Algebra 1, 2012 View details

2. Order of Operations

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Exercise 73 Page 15

Recall the formula for finding the area of a circle.

9π units^2

Practice makes perfect

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 circle's diameter is 6, so the radius is 3. 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

CommutativePropMult

Commutative Property of Multiplication

A=9π

The area of the circle is 9π squared units.

Subchapter links

Check Your Understanding p.12

Practice and Problem Solving p.13-14

H.O.T. Problems p.14

Standardized Test Practice p.15

Spiral Review p.15

Skills Review p.15