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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    

 

Hemisphere
A 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.

hemisphere globe

red line

Heptagon
A 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.

regular heptagon

red line
Hexagon
A 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.

regular hexagon

red line

Hexahedron
A 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).

hexahedron

red line

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

horizontal line

 

Hyperbola
Here's the official algebra definition:  A hyperbola is the intersection of a vertical plane with two inverted circular cones.  It is the set of points whose distances from two fixed points (the foci)  have  a constant distance.

For more info, more pictures and an easier explanation of what a hyperbola really is, check out my Intro to Hyperbolas lesson.

hyperbola

red line

Hypotenuse
The hypotenuse of a right triangle is the side that is opposite the right (90 degree) angle.

hypotenuse of a right triangle

 

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