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Hexagon

math Maturity 5-7 Next article →

A hexagon is a shape with six sides and six corners. The name comes from Greek words meaning "six" and "corner."

Regular hexagon 1
Regular hexagon 1

In a simple hexagon, the inside angles always add up to 720 degrees. Some hexagons are special because they are "regular." A regular hexagon has sides that are all the same length. It also has corners that are all the same size. Each corner in a regular hexagon is exactly 120 degrees. This is one-third of a full circle.

Regular polygon 6 annotated
Regular polygon 6 annotated

You can find the hidden parts of a regular hexagon by looking closely. If you pick a point in the very center, you can draw lines to every corner. This splits the hexagon into six equal equilateral triangles.

Hexagon dissection
Hexagon dissection

Because of these triangles, the longest distance across the shape is twice the length of one side. You can also think of a regular hexagon as a large triangle with its corners cut off. A regular hexagon is also "bicentric." This means you can draw one circle that touches all its corners and another circle that touches the middle of every side.

Regular polygon 12 annotated
Regular polygon 12 annotated

Math explorers have studied the patterns of these shapes for a long time. One famous mathematician, John H. Conway, helped describe how these shapes have symmetry. Symmetry is when a shape looks the same even if you flip it or turn it.

Hexagon reflections
Hexagon reflections

A regular hexagon has six different ways it can be turned to look the same. It also has six lines where you can fold it perfectly. These patterns are part of a larger group called dihedral symmetry. There are many ways to change a hexagon, but the regular version is the most balanced.

Regular hexagon symmetries
Regular hexagon symmetries

Hexagons are very useful for covering flat surfaces without leaving any gaps. This is called tiling or tessellation.

Isohedral tiling p6-1
Isohedral tiling p6-1

When three hexagons meet at every corner, they fit together perfectly. You can see this happening in nature inside a beehive. Bees build honeycombs using hexagons because it is very efficient. This shape uses the least amount of wax to fill a space. It also makes the honeycomb very strong when it is pressed.

Isohedral tiling p6-12
Isohedral tiling p6-12

Other shapes like squares and triangles can tile too, but the hexagon is quite special.

Sometimes, hexagons do not stay flat on a table. A "skew" hexagon has corners that do not all lie on the same plane. These can zig-zag through space like a path.

Cube-skew-orthogonal-skew-frame
Cube-skew-orthogonal-skew-frame

You can even see a version of this shape in a cube. Another way to see a hexagon is as a star shape. This is called a hexagram, which is made by putting triangles on the edges of a hexagon.

Hexagram
Hexagram

Whether they are flat, star-shaped, or zig-zagging, hexagons are everywhere in math and the world.

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🖼️ Images & Media (84)
File:Regular hexagon 1.svg
Regular hexagon 1.svg
File:Hexagon reflections.svg
Hexagon reflections.svg
File:Regular hexagon symmetries.svg
Regular hexagon symmetries.svg
File:Isohedral_tiling_p6-13.svg
Isohedral_tiling_p6-13.svg
File:Isohedral_tiling_p6-12.svg
Isohedral_tiling_p6-12.svg
File:Isohedral_tiling_p6-7.svg
Isohedral_tiling_p6-7.svg
File:Isohedral tiling p6-11.svg
Isohedral tiling p6-11.svg
File:Isohedral tiling p6-10.svg
Isohedral tiling p6-10.svg
File:Isohedral tiling p6-9.svg
Isohedral tiling p6-9.svg
File:Isohedral tiling p6-1.svg
Isohedral tiling p6-1.svg
File:Root system A2.svg
Root system A2.svg
File:Root system G2.svg
Root system G2.svg

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