The circumference of a circle is:
Radius = r, Diameter = d, C = Circumference
C=2πr (as 2r=d)
C=πd
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If the radius of the circle is 26" then its diameter must be 52".
This means that the bicycle wheel has a circumference of 52π".
I'm going to divide 52π" into 360 parts (because a circle is made up of 360 degrees). I'll then multiply this value by 80 to give you an answer.
[tex]\frac { 52\pi }{ 360 } \times 80=\frac { 104 }{ 9 } \pi [/tex]
Answer:
[tex]\frac { 104 }{ 9 } \pi "[/tex]
