Answer:
b = [tex]\frac{A-2\pi rh}{2}[/tex]
Step-by-step explanation:
Given
A = 2πrh + 2b ( subtract 2πrh from both sides )
A - 2πrh = 2b ( divide both sides by 2 )
[tex]\frac{A-2\pi rh}{2}[/tex] = b
