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Cone Net Generator

Unfold a cone into a sector + circle — with computed angle and slant height

A cone net consists of a circular sector (the lateral surface) and a circle (the base). The sector's radius equals the slant height l, and its angle is θ = (r/l) × 360°.

Enter radius and height — the calculator computes the slant height, sector angle, net drawing, volume, and surface area using πr² + πrl.

Every net is printable with exact measurements.

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FAQ

What does a cone net look like?
A cone net has two parts: a circular sector (a "pizza slice" shape that wraps to form the lateral surface) and a circle (the base). The sector's arc length equals the base circumference 2πr.
How do I calculate the cone sector angle?
The sector angle is θ = (r/l) × 360°, where r is the base radius and l is the slant height. For example, if r=2 and l=4, then θ = (2/4)×360° = 180°.
What is the surface area of a cone?
Total surface area = πr² + πrl. The first term is the base circle, the second is the lateral (sector) surface. The slant height l = √(r² + h²).
Can I print this net?
Yes! Save via the share/export button, then print. The sector angle and dimensions are mathematically exact.

Related Topics

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