half plane: the set of all points in a plane that lie on one side of a line in the plane.
harmonic sequence: a sequence is a harmonic sequence
if the reciprocals of the numbers
in the sequence form an arithmetic sequence.
heptagon: a polygon with seven sides.
Heron's formula: a formula for the area of a triangle:
A = (s(s - a)(s - b)(s - c))
where a, b, and c are the lengths of the sides of the triangle, and
s is half the perimeter.
hexadecimal number: a number written in base sixteen.
hexagon: a polygon with six sides.
hexahedron: a polyhedron with six faces. A regular hexahedron is a cube.
hyperbola: the set of all points in a plane such that the difference of the distances to two
fixed points is a constant. The general equation for a hyperbola is
x2 - y2 =
hyperbolic functions: the hyperbolic functions are defined as follows:
hyperbolic cosine: cosh x = (1/2)(ex + e-x)
hyperbolic sine: sinh x = (1/2)(ex - e-x)
hyperbolic tangent: tanh x = sinh
hypotenuse: the longest side of a right triangle. The
side opposite the right angle in a
hypothesis: a proposition that is being investigated, it has yet to be proven.
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