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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 = 59ft? What is the diameter? 5) A = 197cm2 What is the diameter?

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
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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