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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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.
What can it graph?
It can plot explicit, implicit, and parametric functions, add points and geometry, and animate sliders on the same graph.
Can I use voice or a photo?
Yes. You can talk to the tutor, upload a worksheet or handwritten problem, and let the graph update from that input.
Will it explain the steps?
Yes. The AI explains what it is drawing and why, so you see the answer on the graph instead of getting only a final number.