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Geometry Terms
Mrs. Manning- Yalesville
48
Mathematics
02/15/2012

Term
 Point
Definition
 a single exact location often shown by a dot
Term
 Line
Definition
 a straight path that is endless in both directions
Term
 line segment
Definition
 a straight path from one point to another point
Term
 ray
Definition
 a part of a line that starts at one end point and continues forever in one direction
Term
 array
Definition
 arrangement of things in order
Term
 intersect
Definition
 lines that meet at a point
Term
 intersection
Definition
 the point where 2 lines meet
Term
 parallel lines
Definition
 lines that stay the same distance apart forever and ever
Term
 perpendicular Lines
Definition
 two lines that intersect at right angles -90 angles-(makes square corner)
Term
 horizontial line
Definition
 a line going left to right or side to side
Term
 vertical line
Definition
 a line going up and down
Term
 oblique line(Skew)
Definition
 a slanted or diagonal line
Term
 grid
Definition
 a system of horizontal and vertical lines used to locate co-ordinates
Term
Definition
 a system for dividing a grid into 4 parts
Term
 Horizontal axis
Definition
 the left to right number line on a graph
Term
 X-axis
Definition
 horizontal axis on a grid
Term
 vertical axis
Definition
 the up and down number line on a grid
Term
 Y-axis
Definition
 vertical axis on a grid
Term
 Origin
Definition
 where the x-axis meets the y-axis
Term
 co-ordinates
Definition
 numbered pair used in graphing to locate a point
Term
 (7, 4) (x,y)
Definition
 an example of co-ordinates
Term
 (0,0)
Definition
 co-ordinates for the origin
Term
 simple closed curve
Definition
 any path that starts at a point and comes back to the same point without intersecting itself
Term
 circle
Definition
 a closed curve in which all the points are the same distance
Term
 circumference
Definition
 the distance around the outside of a circle
Term
 arc
Definition
 part of the outside of a circle
Term
 chord
Definition
 line segment having it?s endpoints on the circle
Term
 diameter
Definition
 a line segment that passes thru the center of a circle and has it?s endpoints on the circle
Term
Definition
 a line segment with one endpoint on the circle and the other in the center of the circle
Term
Definition
Term
 compass
Definition
 an instrument used to measure circles
Term
 concentric circles
Definition
 circles with the same center but different radii(bullseye)
Term
 tangent
Definition
 line that touches one point on the circumference of a circle
Term
 semi-circle
Definition
 half a circle(180*)
Term
 congruent
Definition
 figures that are the exactly the same shape and size
Term
 similar
Definition
 figures that are the same shape but different size
Term
 symmetric figure-
Definition
 figure that if folded in half both sides will match
Term
 line of symmetry
Definition
 line that divides a symmetric figure in half (often a dotted line)
Term
 asymmetrical figure
Definition
 figure that if folded in half the halves will not match up-no line of symmetry
Term
 angle
Definition
 two rays that start from the same point
Term
 vertex
Definition
 the point where two rays of an angle meet
Term
 vertices
Definition
 plural of vertex
Term
 acute angle
Definition
 an angle less than 90
Term
 right angle
Definition
 an angle with exactly 90 [a perpendicular angle]
Term
 obtuse angle
Definition
 an angle more that 90 but less than 180(91 to 170)
Term
 straight angle
Definition
 an angle with exactly 180[straight line]
Term
 degree
Definition
 unit of measure for angles
Term
 protractor
Definition
 instrument for measuring angles
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