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Big Ideas Math: Modeling Real Life, Grade 8
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Big Ideas Math: Modeling Real Life, Grade 8 View details
3. Rotations
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Exercise 5 Page 60

We can find the circumference C using the formula C = 2π r where r represents the radius of the given circle.

About 3.14 feet

Practice makes perfect

Let's take a look at the given diagram.

Window with measure of its radius
We want to find the circumference C of the given object. It is a circle and the given distance is its radius r. We can find the circumference of a circle using the following formula. C = 2 π r Let's keep in mind that we want to approximate π by 3.14 or 227. We will choose 3.14, because the given radius is a decimal. Let's substitute 0.5 for r.
C = 2π r
Substitute

r= 0.5

C = 2π ( 0.5)

π ≈ 3.14

C ≈ 2( 3.14) (0.5)
CommutativePropMult

Commutative Property of Multiplication

C ≈ 3.14(2) (0.5)
Multiply

Multiply

C ≈ 3.14(1)
IdPropMult

Identity Property of Multiplication

C ≈ 3.14
Since the radius is in feet, the circumference is about 3.14 feet.
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arrow_right Try It p.56-58
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Try It 3 (Page 57)
Try It 4 (Page 57)
Try It 5 (Page 57)
Try It 6 (Page 58)
arrow_right Self-Assessment for Concepts & Skills p.58
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Self-Assessment for Concepts & Skills 8 (Page 58)
arrow_right Self-Assessment for Problem Solving p.59
Self-Assessment for Problem Solving 9 (Page 59)
Self-Assessment for Problem Solving 10 (Page 59)
arrow_right Review & Refresh p.60
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Review & Refresh 4 (Page 60)
Review & Refresh 5 (Page 60)
arrow_right Concepts, Skills, & Problem Solving p.60-62
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Concepts, Skills, & Problem Solving 7 (Page 60)
Concepts, Skills, & Problem Solving 8 (Page 60)
Concepts, Skills, & Problem Solving 9 (Page 60)
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Concepts, Skills, & Problem Solving 13 (Page 61)
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