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Half-closed
interval
Including only
one endpoint but not the other; of the form [a,b) or (a,b] or equivalently
 .
Linear inequalities
System of inequalities
Heron's
Formula
A formula for
the area of a triangle  ,
where a, b, c are side of the triangle and  .
For example, if the sides of a triangle are 7, 5, 4 then
 .
Height
The length from
the vertex to the opposite base, or the length between two parallel
sides or parallel face for a polygon or solid. For example,
in the following triangle, the height is drawn.
Hexagon
A plane figure
with six sides.
Hypotenuse
For a right
triangle, the side opposites the right angle is called the hypotenuse.
For any right triangle, the Pythagorean theorem asserts that:
(leg 1)2 + (leg 2)2 = (hypotenuse)2
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