How to Use the Circle, Cylinder & Sphere Geometry Calculator
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Select shape: 2D Circle, 3D Cylinder, or 3D Sphere.
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Enter any known dimension (Radius, Diameter, Circumference, or Height).
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The calculator computes all geometric properties: Circumference ($2\pi r$), Base Area ($\pi r^2$), Cylinder Volume ($\pi r^2 h$), and Sphere Volume ($\frac{4}{3}\pi r^3$).
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View formulas with exact $\pi$ representation and rounded decimal approximations.
Practical Example & Use Case
Common Real-World Scenario
Calculating that a 10-inch diameter cylinder with height 15 inches holds approximately 1,178.1 cubic inches (5.1 U.S. gallons).
Technical Notes & Limitations
Browser Engine Architecture
Calculates high-precision Euclidean circular geometry using `Math.PI`.
Frequently Asked Questions
What is the formula for the surface area of a sphere?
Surface Area $= 4\pi r^2$, which is exactly 4 times the area of a circle with the same radius.