For a circle, use the area formula: (A = pi r^2)
Solve for the radius: (r = sqrt{frac{A}{pi}})
Use the circumference formula: (C = 2pi r)
Substitute the radius from the area formula: (C = 2pi sqrt{frac{A}{pi}})
Simplify: (C = 2sqrt{pi A})
For a circle, use the area formula: (A = pi r^2)
Solve for the radius: (r = sqrt{frac{A}{pi}})
Use the circumference formula: (C = 2pi r)
Substitute the radius from the area formula: (C = 2pi sqrt{frac{A}{pi}})
Simplify: (C = 2sqrt{pi A})