Half, Hectare, Helix!

Use these math words that start with H to find Math terms that begin with the letter H. You can also print or download our free printable PDF download Math Dictionary. I like to keep this in my binder.

Math Words That Start With H: Half, Hectare, Helix. Find a printable Math Dictionary toward the bottom of this page.

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**Half-Line** - a ray.

**Half-Plane** - the part of a plane that lies on one side of a given line.

**Hankel Matrix** - a matrix in which all the elements are the same along any diagonal that slopes from northeast to southwest.

**Harmonic Analysis** - the study of the representation of functions by means of linear operations on characteristic sets of functions.

**Harmonic Division** - a line segment is divided harmonically by two points when it is divided externally and internally in the same ratio.

**Harmonic Mean** - the harmonic mean of two numbers a and b is 2ab/(a + b).

**Hectare** - a unit of measurement in the metric system equal to 10,000 square meters (approximately 2.47 acres).

**Height of the Triangular Prism** - the distance between the two bases.

**Helix** - the path followed by a point moving on the surface of a right circular cylinder that moves along the cylinder at a constant ratio as it moves around the cylinder. The parametric equation for a helix is x=a cos t; y=a sin t; z=bt

**Hemisphere** - half of a sphere.

**Heptagon** - a seven sided polygon.

**Heronian Triangle** - a triangle with integer sides and integer area.

**Hexagon** - polygon having six equal sides and six equal angles.

**Hexagonal Number** - a number of the form n(2n-1).

**Hexagonal Prism** - a prism with a hexagonal base.

**Hexahedron** - a polyhedron having 6 faces. The cube is a regular hexahedron.

**Hexomino** - a six-square polyomino.

**Histogram** - a bar graph such that the area over each class interval is proportional to the relative frequency of data within this interval.

**Homeomorphism** - a one-to-one continuous transformation that preserves open and closed sets.

**Horizontal Line** - a line parallel to the earth’s surface or the bottom of a page.

**Hundred** - 100.

**Hundreds column** - third column of numbers to the left of the decimal point.

**Hyperbola** - a curve with equation x2/a2-y2/b2=1.

**Hyperbolic Spiral** - the curve whose equation in polar coordinates is r*theta=a.

**Hyperboloid** - a geometric solid whose equation is x2/a2+y2/b2-z2/c2=1 orx2/a2+y2/b2-z2/c2=-1.

**Hypotenuse** - the longest side of a right triangle.

I print and keep these Math definitions as a glossary in my binder: Free Printable Math Dictionary For Kids.

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See the alphabetical links below for more online Math words.

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