math math math
posted by lily .
what are the formulas for the area and circumfrence of a circle

A = pi * r^2
C = pi * d
http://www.mathsisfun.com/geometry/circle.html
Respond to this Question
Similar Questions

Math
Which of the following dimensions of a circle is always smaller than the other two? 
math
what is the formula for the circumfrence of a circle? 
Math
When something says that I'll be tested on formulas for perimeter and area of polygons, does that mean I'll just have to know the formulas, or that I'll have to know how to use the formulas, or both? 
Math
How do you find the circumfrence of a circle? 
math
I'm asked to find the circumference of a circle to the nearest tenth and the area of the same circle to the nearest hundredth. The circle has a diameter of 30 and a radius of 15. I got a circumference of 94.2 and an area of 188.48cm2 … 
8th grade math
circle A has a raduis that is twice the length og the raduis of circle B. Which is an accurate statement about the relationship of these areas of circle A and B and y? 
math
A circle has an area of 25 pi cm^2.If a circle is drawn within that circle with a diameter equal to the radius of the first circle, what is the area of the second circle? 
Math
Find the circumfrence of the given circle. Round to the nearest tenth. The radius of the circle is 3.5 cm. A. 22.0 CM B. 28.5 CM C. 11.0 CM D. 42.8 CM Is the answer A? 
MATH
what is the diameter of a circle with a circumfrence of 47.1 
Math
Hello, What are the different formulas for circles (radius, circumfrence, diameter, area)?