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# Chapter 5 part A

### Chapter 5 Review

Acute Angle An angle that measures lesss than 90 degrees
Acute Triangle A triangle that has three
Angle A figure formatted by two rays with a common end point called the vertex.
Center of rotation The point about which the figure is rotated
Complementary Angles Two angles whose measures add at 90 degrees
Congruent Having the same size and shape.
Correspondence The relationship between two or more objects that are matched.
Equilateral Triangle a triangle with three congruent sides.
Image A figure resulting from a transformation.
Isosceles Triangle A triangle with at least two congruent sides.
Line A straight path that extends without an end in opposite directions
Line of symmetry The imaginary mirror in line of symmetry.
Obtuse angle An angle that is measured and is greater than 90 but less than 180.
Obtuse triangle A triangle containing one obtuse angle.
Parallel lines Lines in a plane that do not intersect.
Parallelogram Quadrilateral with two pair of parallel sides
Perpendicular lines Lines that intersect two parallel lines
Plane A flat surface that extends forever
Point An exact location in space
Polygon A closed plane figure formed by three or more lines segments that intersect only at their end points (vertices).
Ray A part of a line that starts at one end point and it extends forever
Rectangle a parallel line with four right angles.
Reflection A transformation of a figure that flips the figure across a line.
Regular polygon Polygon with congruent sides and angles.
Rhombus a parallelogram with all sides congruent.
Right angle An angle that measures 90 degrees
Right triangle A triangle containing a right angle.
Rise a vertical change when the slope of a line is expressed as a ratio “rise over run”.
Rotation A transformation in which a figure is turned around a point.
Rotational Symmetry A figure has rotational symmetry if it can be rotated less than 360 degrees around a central point and concide with original figure.
Run The horizontal change when the slope of a line is expressed as the ratio "rise over run"
Scalene Triangle A triangle with no congruent sides
Segment A part of a line between two end points
Slope A measure of the steepness of a line on a graph; the rise divided by the run
Square A rectanhgle with four congruent sides
Supplementary angles Two angles who measures have a sum of 180 degrees
Tessellation A repeating pattern of plane figures that completely cover a plane with no gaps or overlaps
Transformation A change in the size or postion in a figure
Translation A movement of a figure along a straight line
Transversal A line that intersects two or more lines
Trapezoid A quadriladeral with exactly 1 pair of parellel sides
Triangle Sum Theorem The theorem that states the measures of the angles in a triangle add up to 180 degrees
Vertical angles A pair of opposite congruent angles formed by intersecting lines
Created by: smath77