| H | ||
|---|---|---|
| Hectare | Standard unit for measuring large areas. Equal to 100 by 100 meters. | |
| Hectometer | A hundred meters. | |
| Height | Measurement from top to bottom. | |
| Hemisphere |
Half of a sphere. | |
| Hepta- | Prefix meaning seven. | |
| Heptagon | Polygon with seven sides. | |
| Hexa- | Prefix meaning six. | |
| Hexagon |
Polygon with six sides. | |
| Hexahedron | Polyhedron with six faces. | |
| Highest Common Factor | Largest number that would divide two or more numbers exactly. | |
| Horizontal | Parallel to the horizon. | |
| Hypotenuse | Longest side in a right triangle. | |