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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

3. Rotations

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Exercise 4 Page 60

We can find the circumference C using the formula C = π d where d represents the diameter of the given circle.

About 35.796 inches

Practice makes perfect

Let's take a look at the given diagram.

Log with measure of its diameter

We want to find the circumference C of the given object. It is a circle and the given distance is its diameter d. We can find the circumference of a circle using the following formula. C = π d Let's keep in mind that we want to approximate π by 3.14 or 227. We will choose 3.14, because the given diameter is a decimal. Let's substitute 11.4 for d.

C = π d

d= 11.4

C = π ( 11.4)

π ≈ 3.14

C ≈ 3.14 (11.4)

Multiply

C ≈ 35.796

Since the diameter is in inches, the circumference is about 35.796 inches.

Subchapter links

Try It p.56-58

Self-Assessment for Concepts & Skills p.58

Self-Assessment for Problem Solving p.59

Review & Refresh p.60

Concepts, Skills, & Problem Solving p.60-62