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H

Heptagon

A polygon with seven sides or edges.

Hexagon

A polygon with six sides or edges. Adjective: hexagonal, having the form of a hexagon.

Highest Common Factor (HCF)

The common factor of two or more numbers which has the highest value. Example: 16 has factors 1, 2, 4, 8, 16. 24 has factors 1, 2, 3, 4, 6, 8, 12, 24.

56 has factors 1, 2, 4, 7, 8, 14, 28, 56. The common factors of 16, 24 and 56 are 1, 2, 4 and 8. Their highest common factor is 8.

Histogram

A particular form of representation of grouped data. Segments along the x axis are proportional to the class interval. Rectangles are drawn with the line segments as bases. The area of the rectangle is proportional to the frequency in the class. Where the class intervals are not equal, the height of each rectangle is called the frequency density of the class.

Horizontal

Parallel to the horizon. Also in the direction of the x axis in a Cartesian co-ordinate system.