Step-by-Step Solution
- Start with the circle area formula: A = πr²
- Solve for radius: r = √(A/π)
- Calculate diameter: d = 2r
r = √(21.396/π) = 2.6097 inches
d = 2 × 2.6097 = 5.2194 inches
Instant diameter calculation and visualization
r = √(21.396/π) = 2.6097 inches
d = 2 × 2.6097 = 5.2194 inches