Find the unknown measure. Round to the nearest whole number. 3) A = 1567 in.2 What is the radius? 4) A = 59ft? What is the diameter? 5) A = 197cm2 What is the diameter?

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Find the unknown measure. Round to the nearest whole number.
3) A = 1567 in.2
What is the radius?
4) A = 59ft2
What is the diameter?
5) A = 197cm2
What is the diameter?
Transcribed Image Text:Find the unknown measure. Round to the nearest whole number. 3) A = 1567 in.2 What is the radius? 4) A = 59ft2 What is the diameter? 5) A = 197cm2 What is the diameter?
Example 4
Finding the Radius of a Circle
The area of a circle is 72 square millimeters. Find the radius of the
circle to the nearest millimeter.
A = Tr?
Write formula for area of a circle.
%3D
72 (3.14)r2
Substitute 72 for A and 3.14 for T.
22.9 - r2
Divide each side by 3.14.
V22.9 -r
Take positive square root of each side.
4.8 r
Use a calculator to approximate square root.
Answer To the nearest millimeter, the radius is 5 millimeters.
Transcribed Image Text:Example 4 Finding the Radius of a Circle The area of a circle is 72 square millimeters. Find the radius of the circle to the nearest millimeter. A = Tr? Write formula for area of a circle. %3D 72 (3.14)r2 Substitute 72 for A and 3.14 for T. 22.9 - r2 Divide each side by 3.14. V22.9 -r Take positive square root of each side. 4.8 r Use a calculator to approximate square root. Answer To the nearest millimeter, the radius is 5 millimeters.
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