body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

McGraw Hill Integrated II, 2012

MH

McGraw Hill Integrated II, 2012 View details

4. Volumes of Prisms and Cylinders

Finish the assignment

Continue to next subchapter

Exercise 59 Page 838

Recall the formula for finding the area of a circle.

9.3in

Practice makes perfect

The area of a circle with radius r is calculated using the formula below. A=π r^2 From the exercise, we know that the area of the circle is 271in^2. By substituting 271 for A in the formula, we can calculate r.

A=π r^2

A= 271

271=π r^2

▼

Solve for r

.LHS /π.=.RHS /π.

271/π = r^2

sqrt(LHS)=sqrt(RHS)

sqrt(271/π) = r

Rearrange equation

r = sqrt(271/π)

Use a calculator

r = 9.287732...

Round to 1 decimal place(s)

r≈ 9.3

The radius is approximately 9.3in.

Subchapter links

Exercises p.834-838