# Math Dictionary h

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**H**

**Half turn:**A 180 degree rotation about a point.

**Handspan :**Handspan The distance from the tip of the thumb to the tip of the little finger on your outstretched hand.

**Hectare (ha) :**A hectare is a unit of area equal to 10,000 square meters. Usually used to measure land.1 ha = 2.47 Acres approximately.

**Height :**The vertical distance from top to bottom.

**Heptagon :**A 7-sided polygon.

**Hemisphere**Half of a sphere bounded by a great circle.

**Heron's formula :**The formula expressing the area of a triangle, A , in terms of its sides a , b , and c .

A = √[s (s − a)(s −b)(s − c)] where s = a + b + c and is called the semi-perimeter.

**Hexagon :**A polygon with six sides.

**Highest Common Factor :**Another name for "Greatest Common Factor".

**Hindu -Arabic system :**The name given to our number system.It was developed by the Hindus and Arabs many years ago.

**Horizontal :**Going side-to-side, like the horizon.Parallel to the horizon.

**Hour :**A period of time equal to 1/24 (a twenty-fourth) of a day.1 day = 24 hours and 1 hour = 60 minutes.

**Hundredth :**One part in a hundred equal parts.

**Hyperbola**Set of points P in a plane such that the difference between the distances from P to the foci 1 F and 2 F is a given constant k .

**Hypotenuse :**The side of a right triangle opposite the right angle; the longest side of a right triangle.

**Hypotenuse and leg triangle congruence :**If there exists a one-to-one correspondence between the vertices of two right triangles such that the hypotenuse and leg of one right triangle are congruent to the hypotenuse and corresponding leg of the second right triangle, then the triangles are congruent.

**Hypothesis :**An assumed statement used as a premise in a proof; the “given"; the “if" clause of an “if-then" statement.

**Math dictionary h**

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