A cone can be cut by an oblique plane.

The main interest of this page is to see how a cone cut by an oblique plane can be developed into a plane.

This in another example:

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Plane developments of geometric bodies (6): Pyramids cut by an oblique plane Plane net of pyramids cut by an oblique plane.

Plane developments of geometric bodies (5): Pyramid and pyramidal frustrum Plane net of pyramids and pyramidal frustrum. How to calculate the lateral surface area.

Plane developments of geometric bodies (4): Cylinders cut by an oblique plane We study different cylinders cut by an oblique plane. The section that we get is an ellipse.

Plane developments of geometric bodies (3): Cylinders We study different cylinders and we can see how they develop into a plane. Then we explain how to calculate the lateral surface area.

Plane developments of geometric bodies (2): Prisms cut by an oblique plane Plane nets of prisms with a regular base with different side number cut by an oblique plane.

Plane developments of geometric bodies (1): Nets of prisms We study different prisms and we can see how they develop into a plane net. Then we explain how to calculate the lateral surface area.

Leonardo da Vinci: Drawing of a truncated octahedron made to Luca Pacioli's De divina proportione. Leonardo da Vinci made several drawings of polyhedra for Luca Pacioli's book 'De divina proportione'. Here we can see an adaptation of the truncated octahedron.

The volume of a truncated octahedron The truncated octahedron is an Archimedean solid. It has 8 regular hexagonal faces and 6 square faces. Its volume can be calculated knowing the volume of an octahedron.

The volume of the tetrahedron The volume of a tetrahedron is one third of the prism that contains it.

Volume of an octahedron The volume of an octahedron is four times the volume of a tetrahedron. It is easy to calculate and then we can get the volume of a tetrahedron.