Circumference of a Circle, Value of 5!
Date: 5/15/96 at 18:44:1 From: Anonymous Subject: Circumference of a circle The area of a circle is 16 pi. What is the circumference of the circle? 1) 8 pi 3) 16 pi 2) 2 pi 4) 4 pi I haven't tried anything yet because I'm totally lost. ALSO The value of 5! is 1) 120 2) 25 3) 15 4) -5
Date: 5/16/96 at 17:35:25 From: Doctor Jodi Subject: Re: Circumference of a circle Hi there! The area of a circle and its circumference are both related to its radius. Here are the equations: circumference = pi*2*radius area = pi*radius*radius Let me do an example for you. If the area of the circle is 9 pi, then we can use area = pi*radius*radius to find that the radius is 3. Next we can use the equation circumference = pi*2*radius to find that circumference = pi*2*3 = 6pi Can you follow these same steps to find the answer to your question? Let us know if you need more help. #! is an expression that means "multiply # and all of the numbers less than # but greater than 0 together" For example, 8! = 8*7*6*5*4*3*2*1 Does this make sense? Write us back if you need more help. -Doctor Jodi, The Math Forum Check out our web site! http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.