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Circle Calculator

Calculate circle properties from radius โ€” diameter, circumference, and area. Includes SVG visualization and sphere (3D) surface area and volume.

ฯ€ = 3.14159265โ€ฆ
r d = 2r C = 2ฯ€r A = ฯ€rยฒ

Radius

Diameter

Circumference

Area

Sphere (3D)

Surface Area

Volume