Basic math glossaryH define words beginning with the letter H
h: h is an abbreviation for height.
Halfline: A halfline is a ray or part of a line with a starting point called endpoint and all the points of the line on one side of the endpoint.
Halfplane: A halfplane is the portion of a plane that lies on one side of a given line.
Harmonic mean: The harmonic mean of two numbers x and y is 2xy/(x + y).
Head: In probability, it is one of the possible outcomes when you toss a coin.
Hectare: A unit of area that is equal to 2.47 acres or 10000 square meters.
Height: The distance from bottom to top, also called altitude.
Hemisphere: A hemisphere is half a sphere.
Heptagon: A polygon that has seven sides.
Hexagon: A polygon with six angles and six sides.
Hexagonal Number: A number of the form n(2n  1)
Hexagonal prism: A prism that has hexagonal faces.
Histogram: A histogram is a graphical way to display information or data using a bar graph.
Horizontal line: A line that has no slope.
Horizontal axis: One of the axis in the coordinate system that has a slope of zero.
Hundred: A number that is equal to 1 more than 99.
Hundreds column: The third column is the column located 3 places to the left of the decimal point.
Hypotenuse: The longest side in a right triangle. The longest side is the one opposite to the right angle.
