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# Geometry Vocab

### vocab quiz 3

TermDefinition
Ordered Triple Three numbers written in the form (x, y, z).
n-tuple n numbers written in the form (x1, x2, x3, . . . , xn).
Orthocenter of a triangle The point where three altitudes of a triangle intersect.
Outcome The result of an experiment in probability theory.
Overlap Similar triangles in which one triangle is on top (overlapping) another triangle.
Parallel Two lines that are on a plane and NEVER meet. Two lines that are always the same distance apart.
Permutation All possible arrangements of a collection of things, where order is important.
Perpendicular A strait line at an angle of 90 degrees to a given line, plane or surface.
Perpendicular Bisector A line or ray that cuts another line segment into two equal parts at 90 degrees
Perpendicular Bisector Theorem The perpendicular bisector of a line segment is the focus of all points that are equidistant from its endpoints.
Perpendicular Bisector Theorem Converse If a point is equidistant from the endpoints of a segment, then it is on the perpendicular bisector of the segment.
Point of concurrency The point where three or more lines intersect
Point of symmetry A special center point for a certain kinds symmetric to a figure or graph
Polygon Angle sum-theorem The sum of the measures of the angles of an n-gon is (n–2)180
Polygon Angle sum-theorem coverse The measure of each interior angle of a regular n-gon is 180*(n–2)/n)
Polygon exterior angle-sum theorem If a polygon is convex, then the sum of the measures of the exterior angles, one at each vertex, is 360.
Preimage The original figure prior to a transformation
Probability The chance that something will happen or how likely it is that an event wild happen
Probability distribution A graph, table, or formula that gives the probability for each value of the random variable
Probability formula The number of ways an event can occur divided by the total number of possible outcomes (see also conditional probability formula)
Isosceles triangle A triangle with two equal sides
Proportions Comparative relation between things or magnitudes as to size, quantity, number, etc.
Pythagorean theorem An equation relating the lengths of the sides of a right triangle.
Ratios The result of dividing one number or expression by another.
Ray A part of a line that begins at a particular point (called the endpoint) and extends endlessly in one direction