Half, Hectare, Helix!

*FTC disclosure**: I recommend products I think will help you and your children. If you buy through my links I earn ad commissions at no extra cost to you.*

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.

**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.

You can also download it to your tablet or bookmark the page.

See the alphabetical links below for more online Math words.

N * O * P * Q * R * S * T * U * V * W * X * Y * Z

Sample Math practice worksheets. Bundle includes dictionary for Math.

2. One PDF Download. No ads.

3. Filed by topic.

4. Interactive. Printable.

5. Use with any Math Lesson Plans.

6. Addition, Subtraction, Multiplication, Division and Fraction Practice.

Check out our main printable Math worksheets page.