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Pearson Geometry Common Core, 2011

PG

Pearson Geometry Common Core, 2011 View details

Chapter Review

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Exercise 41 Page 74

Use that C=π d to find the circumference.

Circumference: 15π m
Area: 225/4π m^2

Practice makes perfect

The circumference of a circle can also be found by multiplying the diameter by π. C= π d Let's substitute 15 for d into the formula.

C=π d

d= 15

C=π* 15

Multiply

C=15π

The circumference is 15π meters. Next, we will find the area. To do that, we need the radius of the circle. We can find its radius by dividing the diameter by 2. r=d/2 ⇒ r=15/2m Now, we are able to find its area.

A=π r^2

r= 15/2

A=π*( 15/2)^2

▼

Calculate power

(a/b)^m=a^m/b^m

A=π*15^2/2^2

Calculate power

A=π*225/4

Multiply

A=225/4π

The radius is 2254π m^2.

Subchapter links

Exercises p.70-74