# Online Math Dictionary: H

Easy to understand math definitions for K-Algebra mathematics
Just scroll down or click on the word you want and I'll scroll down for you!

 hemisphere heptagon hexagon hexahedron horizontal hyperbola hypotenuse

 HemisphereA hemisphere is half of a sphere.   On our planet, the top half is called the Northern Hemisphere and the bottom half is called theSouthern Hemisphere.

 HeptagonA heptagon is a seven sided polygon.   The heptagon in the picture on the right is a regular heptagon because all the sides and angles are the same (congruent). For more info on heptagons, check out my properties of heptagons page.
 HexagonA hexagon is a six sided polygon.   The hexagon in the picture on the right is a regular hexagon because all the  sides and angles are the same (congruent). For more info on hexagons, check out my properties of hexagons page.

 HexahedronA hexahedron is a six sided three dimensional geometric figure (a polyhedron).   A regular hexahedron is a cube because all the faces are the same size (congruent).

Horizontal
horizontal line is a line that runs along the horizon.