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# Ch. 7 Vocabulary

### Math 7 - Ch. 7

Circle The set of all points in a plane that are the same distance from a given point
Skew Lines Lines that lie in different planes that are neither parallel nor intersecting
Line A straight path that extends without end in opposite directions
Plane A flat surface that extends forever
Arc A part of a circle named by its endpoints
Vertex The point where two sides intersect
Perpendicular Lines Line the intersect to form right angles
Ray A part of a line that starts at one endpoint and extends forever
Acute angle An angle that measure less than 90 degrees
Radius Line segment with one endpoint at the center of a circle, the other endpoint on the circle
Congruent Having the same size and shape
Line Segment A part of a line between two endpoints
Complementary Angles Two angles whose measures add to 90 degrees
Straight Angle An angle that measure 180 degrees
Sector A region enclosed by two radii and the arc joining their endpoints
Angle A figure formed by 2 rays witha common endpoint
Vertical Angles A pair of opposite congruent angles formed by intersecting lines
Obtuse Angle An angle whose measure is great than 90 degrees but less than 180 degrees
Diameter A line segment that passes through the center of a circle and has endpoints on the circle
Point An exact location in space
Supplementary Angles Two angles whose measures have a sum of 180 degrees
Center of a Circle The point inside a circle that is the same distance from all points on the circle
Right Angle An angle that measures 90 degrees
Parallel Lines Lines in a plane that do not intersect
Chord A line segment with endpoints on a circle
Transversal A line that intersects two or more lines
Central Angle An angle with its vertex at the center of a circle
Polygon A closed figure formed by 3 or more line segments
Side A line bounding a geometric figure
vertex of a polygon The point where 2 sides of a polygon intersect
Regular Polygon A polygon with congruent sides and angles
Scalene Triangle A triangle with no congruent sides
Isosceles Triangle A triangle with at least two congruent sides
Equilateral Triangle A triangle with three congruent sides
Acute Triangle A triangle with all three angles measuring less than 90 degrees
Obtuse Triangle A triangle containing one obtuse angle
Right triangle A triangle containing a right angle
Parallelogram A quadrilateral with 2 pairs of parallel sides
Rhombus A parallelogram with all sides congruent
Rectangle A parallelogram with 4 right angles
Square A rectangle with 4 congruent sides
Trapezoid A quadrilateral with exactly one pair of parallel sides
Diagonal A line segment that connects two non-adjacent vertices of a polygon
Side-side-side Rule A rule stating that is three sides of one triangle are congruent to three sides of another triangle, the triangles are congruent
Transformation A change in size or position of a figure
Image A figure resulting from a transformation
Translation A movement (slide) of a figure along a straight line
Rotation A transformation in which the figure is turned around a point
Reflection A transformation of a figure that flips the figure across a line
Line of Reflection A line that a figure is flipped across to create a mirror image of the original figure
Line Symmetry One-half of a figure is a mirror-image of the other half
Line of Symmetry The imaginary "mirror" in line symmetry
Asymmetry Not identical on either side of a central line; not symmetrical
Rotational Symmetry A figure has rotational symmetry if it can be rotated less than 360 degrees around a central point and coincide with the original figure
Center of Rotation The point about which a figure is rotated
Created by: unverferth