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Answer:
[tex]r = \frac{L}{2\pi h}[/tex]
Step-by-step explanation:
1. Write equation out
[tex]L = 2\pi rh[/tex]
2. Divide 2πh on both sides of the equation
[tex]L=\frac{2\pi rh}{2\pi h}[/tex]
3. Write out new equation
[tex]r = \frac{L}{2\pi h}[/tex]