Sphere Surface Area
Sphere Surface Area
A sphere’s surface area sets its heat-loss, drag and coating requirements; it scales with the square of radius.
The surface area is A = 4π·r². where r is the radius.
Inputs
r := 0.5 m=500 mm
Apply the sphere surface-area formula.
A := 4·pi·r^2=3.14 m^2
Results
The area is exactly four times the great-circle area. The ratio of volume to surface area grows with size, which is why large bodies lose heat more slowly.
Assumptions & limitations
- Perfect sphere.
- Outer surface.
- Radius from the centre.