Wednesday
May 22, 2013

# Homework Help: math

Posted by cici on Sunday, May 20, 2012 at 11:16pm.

the area of a circle is 25 in2. What is the radius, including the units? Area of a circle is ”Ēr2.

• math - Bosnian, Sunday, May 20, 2012 at 11:29pm

A = r ^ 2 * pi = 25 in ^ 2

r ^ 2 * pi = 25 Divide both sides by pi

r ^ 2 = 25 / pi Take the square root of both sides

r = + OR - sqrt ( 25 ) / sqrt ( pi )

r = + OR - 5 / sqrt ( pi )

Radius can't be negative so :

r = 5 / sqrt ( pi )

r = 5 / sqrt ( 3.1416 )

r = 5 / 1.772456

r = 2.82094 in

• math - cici, Sunday, May 20, 2012 at 11:36pm

thank you(:

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