The formula for the circumference of a circle is:
C = pi * 2r
25.12 = 3.14 * 2r
25.12/3.14 = 2r
8 = 2r
8/2 = r
4 = r
pi = 3.14
2 pi = 6.28
C = 2 r pi
25.12 = 2 r pi Divide both sides by 2 pi
25.12 / 2 pi = r
r = 25.12 / 2 pi
r = 25.12 / 6.28
r = 4 cm
Thank You Ms. Sue! :)
Now I understand because I didn't learn this yet in math since we are behind in our curriculum. I'm going to rewrite this so that I way I can use this to study for the exam. I'm going to post more problems (don' worry not too much). I left some geometry questions (about 2) and other problems that I need help with (don't worry it's about 4 more problems or 3 that I'm going to post). Some questions are homework checks to see if I'm correct.
thanks again :)
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