Answer:
see explanation
Step-by-step explanation:
A = πr² ← r is the radius and r = [tex]\frac{1}{2}[/tex] d ← d is the diameter
Hence
π ([tex]\frac{1}{2}[/tex] d)² = A, that is
[tex]\frac{d^2\pi }{4}[/tex] = A ( multiply both sides by 4 )
d²π = 4A ( divide both sides by π )
d² = [tex]\frac{4A}{\pi }[/tex] ( take the square root of both sides )
d = [tex]\sqrt{\frac{4A}{\pi } }[/tex]