### Geometry Vocabulary

Frank Stefan

Vocabulary words for a Euclidean Geometry class.

 Rectangle Same size, same shape. Equiangular Lines that are not coplanar. Supplementary A polygon with 5 sides. Tangent The distance from the center of a regular polygon to a side. Corresponding Points all in one line. Hypotenuse Two angles whose measures have the sum of 180. Pentagon A segment joining two non-consecutive vertices of a polygon. Collinear The sum of the length of the sides of a polygon. Triangle A segment whoes endpoints lie on a circle. Chord A number that describes the steepness of a line. Perimeter A chord that contains the center of a circle. Isosceles Two angles in corresponding positions relative to two lines. Height A segment from a vertex to the midpoint of the opposite side. Angle A polygon with four sides. Diameter A quadrilateral with four right angles. Theorem A statement excepted as true without proof. Similar A quadrilateral with four right angles and four congruent sides. Apothem A line that intersects a circle in exactly one point. Median A polygon with 8 sides. Parallelogram A triangle with two congruent sides. Straight An angle with a measure of 180. Diagonal A polygon with three sides. Decagon A line that contains a chord. Slope The ray that divides the angle into 2 congruent angles. Congruent The length of the altitude of a polygon. Rhombus A polygon with 10 sides. Octagon A quadrilateral with both pairs of opposite sides parallel. Equilateral Coplanar lines that do not intersect. Acute Two angles whose measures have the sum of 90. Bisector A polygon that is equilateral and equiangular. Obtuse An angle with a measure of 90. Regular The side of a right triangle opposite the right angle. Complementary A triangle with all sides equal. Quadrilateral The point that divides a segment into two congruent segments. Opposite An angle with measure between 0 and 90. Segment A quadrilateral with four congruent sides.s Parallel A triangle with all angles equal. Square A figure formed by two rays with a common endpoint. Right An angle with measure between 90 and 180. Skew Points all in one plane. Coplanar Two points on a line and all the points between them. Midpoint Two rays with a common endpoint pointing in opposite directions. Postulate Same shape, different size. Secant A statement that can be proved.

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