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# Mrs. C's Geometry

### Geometry Definitions

TermDefinition
Point An exact position in space.
Line An infinite set of points forming a straight path extending in two directions.
Line segment A part of a line defined by two endpoints.
Plane A flat surface that extends infinitely in all directions.
Parallel Planes Two planes can be parallel to each other, when they are parallel they are in a line.
Angle Two rays that share an endpoint.
Vertex The point at which two line segments,lines, or rays meet to form an angle.
Complementary Angles Two angles what have measures with a sum of 90 degrees
Supplementary Angles Two angles that have measured to 180 degrees.
Congruent Angles When two angles have the same measurement of angles.
Acute Angle An angle that measures less than 90 degrees.
Obtuse Angle An angle with a measurement greater than 90 and less than 180 degrees.
Right Angle An angle that measures 90 degrees.
Straight Angle An angle that measures 180 degrees.
Reflex Angle An angle that measures more than 180 degrees.
Circle A closed curve with all of its points in one plane and the same distance from a fixed point.
Radius The segment or the length of a segment from the center of a circle to a point on the circle.
Diameter A chord that passes through the center of a circle and has endpoints on a circle.
Chord Any line segment that joins tow points on a circle.
Arc The part curved between any two of its points.
Cicumference The measure in a square units of the interior region of a 2D or 3D figure.
Polygons A closed figure formed from a line segments that meet on ly at their endpoints.
Acute Triangle Measures less than 90 degrees.
Obtuse Triangle Measures greater than 90 degrees
Right Triangle Measures 90 degrees.
Scalene Triangle All sides measure different
Isosceles Triangle 2 sides measure the same
Equilateral Triangle All sides have the same measurement
Parallelogram A quadrilateral with two pairs of parallel and congruent angles
Square Parallelogram with 4 congruent sides and angles that are 90 degrees.
Recdtangle A quadrilateral with two pairs of congruent parallel sides and four right angles
Rhombus A parallelogram where all 4 sides are equal in length.
Trapezoid A quadrilateral with exactly one pair of parallel sides
Pentagon A polygon that has 5 sides
Hexagon A polygon that has 6 sides
Octagon A polygon that has 8 sides
Ray A part of a line with one end point and extends indefinitely in one direction
Parallel Lines Lines that always same the same distance apart and will never touch.
Perpendicular LInes Lines that intersect and form a right angle.