# Algebra 1-- I do not understand

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

• Algebra 1-- I do not understand -

C = pi * d

15 = 3.14 * d

15/3.14 = d

4.77707 = d

4.77707 / 2 = r

2.388535 = r

• Algebra 1-- I do not understand -

I still don't understand this.

• Algebra 1-- I do not understand -

Can you explain the steps in solving this formula?

• Algebra 1-- I do not understand -

Please copy and paste the line you don't understand.

• Algebra 1-- I do not understand -

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.

• Algebra 1-- I do not understand -

Circumference = pi * diameter

Then I substituted real numbers for the letters.

• Algebra 1-- I do not understand -

How did you know which numbers to use?

• Algebra 1-- I do not understand -

Your problem stated that the circumference is 15.

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