Homework Help: circles

Posted by Austin on Monday, February 23, 2009 at 6:52pm.

What is the area and circumference of a circle with a radius of 3in.

circles - Willow, Monday, February 23, 2009 at 7:15pm
Like I said with awl, I found the circumference forumla, which is:

c = pi times diameter
OR
c = 2 times pi times radius

I can't find the area formula. :(

Just place in 3 where I said "radius."

Hope I helped! :)
circles - Ms. Sue, Monday, February 23, 2009 at 7:17pm
Area = pi * radius squared

A = pi*r^2
A = 3.14 * 9
A = 28.26 square inches

Related Questions

MATH HOMEWORK - Find the circle circumference and circle area with a circles ...
Algebra - The Circumference and area of a circle of radius r are givin by 2 [pie...
GEOMETRY(CIRCLE) - Three circles with different radii have their centers on a ...
Circumference and Area of Circles - can someone help me with these:Find the ...
math gre question - in an infinite series of circles the radius of the second ...
math - I'm asked to find the circumference of a circle to the nearest tenth ...
area of circle - My circle has a radius of 8ft. What is the distance of the ...
Math - Geometry - A cylindrical solid has a cylindrical circular hold drilled ...
algebra 1 - A high school wrestling mat must be a square with 38-foot sides and ...
Math - The area of a rectangle is shown below The area of the rectangle is 56 ...

For Further Reading

First Name:
School Subject:
Answer: