Question

If a circle's circumference is 15 inches, what is its radius?

Answers

Ms. Sue
C = pi * d

15 = 3.14 * d

15/3.14 = d

4.77707 = d

4.77707 / 2 = r

2.388535 = r

Anonymous
I still don't understand this.
Anonymous
Can you explain the steps in solving this formula?
Ms. Sue
Please copy and paste the line you don't understand.

Anonymous
C = pi * d

15 = 3.14 * d

15/3.14 = d

4.77707 = d

4.77707 / 2 = r

I apologize, but I do not understand any of them.
Ms. Sue
Circumference = pi * diameter

Then I substituted real numbers for the letters.

Anonymous
How did you know which numbers to use?
Ms. Sue
Please memorize pi = 3.154

Your problem stated that the circumference is 15.

heylor
thats wrong. pi equals to 3.14 not 3.154 and im in 7th grade and i know this hahah

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