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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

1. Circumference and Arc Length

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Exercise 4 Page 598

Do you remember the formula for the circumference of a circle?

≈ 20 ft

Practice makes perfect

The circumference C of a circle with diameter d is calculated using the formula below. C=π d From the exercise, we know that the circumference of the circle is 63ft. By substituting 63 for C in the formula, we can calculate the diameter of the circle, d.

C=π d

C= 63

63=π d

.LHS /π.=.RHS /π.

63/π=d

Rearrange equation

d=63/π

Use a calculator

d=20.053522...

Round to nearest integer

d≈ 20

We found that the diameter is about 20ft.

Subchapter links

Communicate Your Answer p.593

Monitoring Progress p.594-597

Exercises p.598-600