Däne has a stamp collection. in one boo he has 6 pages with 15 stamps on each page. in another book,he has 9 pages with 20 stamp
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To find the formula to find radius, solve for r using the formula for circumference.
to solve:
1. divide each side by 2
2. you get r = c/2
to solve:
1. divide each side by 2
2. you get r = c/2