Solution
Step 1
Write out an expression for the circumference of a circle
[tex]\begin{gathered} C\text{ =}\pi d \\ C\text{ is the circumference} \\ d\text{ is the diameter} \end{gathered}[/tex][tex]\begin{gathered} \text{when d = 5}cm \\ C=5\pi cm \end{gathered}[/tex][tex]\begin{gathered} \text{when d=10cm} \\ C=10\pi cm \end{gathered}[/tex]Thus, when the diameter changed from 5cm to 10cm, the circumference is twice the previous size
That is, the circumference when the diameter is 10cm is 2 times the circumference when the diameter is 5cm
