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# Geometry

TermDefinition
Point an exact location on a line, in a plane or in space
Line A straight path of points that goes on forever in opposite directions
line segment part of a line with two end points and all the points between them
ray a part of a line that begins at one end point and goes on forever in one direction
plane a flat surface of points that continues without end in all directions named by at least three points
intersecting lines lines that cross each other at one point
parallel lines lines in the same plane that never intersect and are always the same distance apart
perpendicular lines lines that intersect to form four right angles (90 degrees)
angle two rays with the same end point
vertex end point at which two rays meet in an angle
protractor tool used to measure the degree of an angle
right angle an angle that measures exactly 90 degrees and forms a square corner
acute angle angle that measures greater than 0 degrees and less than 90 degrees
obtuse angle angle that measures greater than 90 degrees and less than 10 degrees
straight angle angle that measures exactly 180 degrees and forms a line.
equilateral triangle a triangle with 3 equal sides
isosceles triangle a triangle with 2 equal sides
scalene triangle a triangle with no equal sides
right triangle a triangle that has a right angle (measures 90 degrees)
acute triangle a triangle that has three acute angles that measure less than 90 degrees
obtuse triangle a triangle that has one obtuse angle that measures more than 90 degrees
parallelogram a quadrilateral with all sides parallel and opposite sides equal
rhombus a parallelogram with four equal sides
trapezoid a quadrilateral with only one pair of parallel sides
square a plane figure with four equal sides and four right angles
rectangle a plane figure with two pairs of equal sides and four right angles
polygon a closed plane figure with sides formed by 3 or more line segments
triangle a polygon with 3 sides and 3 angles
quadrilateral a polygon with 4 sides and 4 angles
pentagon a polygon with 5 sides and 5 angles
hexagon a polygon with 6 sides and 6 angles
octagon a polygon with 8 sides and 8 angles
regular polygon a polygon in which all sides have equal length and all angles have equal measure
irregular polygon a polygon in which all the sides are not equal length and the angles do not have equal measure
circle a closed plane figure made up of many points that are the same distance from the center
center the point from which every point in a circle is exactly the same distance
chord a line segment that has its endpoints on the circle
diameter a chord that passes through the center of a circle
radius a line segment with one end point at the center of a circle and the other end point on the circle
compas a tool used to construct circles
Created by: tebyrum