Geometric Terms.docx

Line

a continuous extent of length

Parallel Line Segments line segments that do not intersect Perpendicular Line Segments

two line segments which cross to form 90 degree angles

Right Angle

a 90 degree angle

Acute Angle

an angle less than 90 degrees but greater than 0 degrees

Obtuse Angle

an angle greater than 90 degrees but less than 180 degrees

Equilateral Triangle

a triangle with all sides equal and all angles equal

Scalene Triangle

a triangle having three unequal sides and angles

Right Triangle a triangle with one internal angle equal to 90 degrees Isosceles Triangle

a triangle which has two sides equal

Square a rectangle having all four sides of equal length Pentagon

a polygon with 5 sides and 5 angles

Parallelogram a quadrilateral having both pairs of opposite sides parallel to each other Rectangle

a parallelogram having four right angles

Rhombus

an equilateral parallelogram having oblique angles

Quadrilateral

a polygon with four sides

Octagon

a polygon having eight angles and eight sides

Trapezoid

a quadrilateral plane figure having two parallel and two nonparallel sides

Hexagon

a polygon having six sides and six angles

Circle - A geometric figure composed of points that are equidistant from a given point. Radius - A segment with one endpoint at the center of a circle and the other endpoint on the circle. Diameter - A chord that intersects with the center of a circle. Chord - A segment whose endpoints are on a circle. Circle Segment - The region within a circle bounded by a chord of that circle and the minor arc whose endpoints are the same as those of the chord.

Sectors - A region inside a circle bounded by a central angle and the minor arc whose endpoints intersect with the rays that compose the central angle.