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27 terms

Math Chapter 8

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Transformation
An operation that changes one figure into another figure.
Reflection
A transformation that creates a mirror image of a figure
Translation
A transformation that slides a figure
Dilation
A transformation that stretches or shrinks a figure
Obtuse Triangle
A triangle with one angle greater than 90 degress
Scalene Triangle
A triangle with no congruent sides
Rhombus
A parallelogram with 4 congruent sides
Parallelogram
A quadrilateral with both pairs of opposite sides parallel
Quadrilateral
A closed geometric figure made up of 4 line segments, called sides, that intersect only at their endpoints
Regular Polygon
A polygon with all sides equal in length and all angles equal
Polygon
A closed figure whose sides are line segments that intersect only at their endpoints
Pentagon
A polygon with 5 sides
Octagon
A polygon with 8 sides
Congruent Segments
Segments that have the same length
Congruent Angles
Angles that have equal measures
Heptagon
A polygon with seven sides.
Complementary Angles
Two angles whose measures have a sum of 90 degrees.
Line Symmetry
A figure that when cut in half has a mirror image of the other half.
Parallel
Two lines on the same plane that never intersect.
Equilateral Triangle
A triangle with three congruent sides.
Acute Angle
An angle whose measure is less than 90 degrees.
Right Angle
An angle whose measure is exactly 90 degrees.
Trapezoid
A quadrilateral with exactly one pair of parallel sides.
Isosceles Triangle
A triangle with at least two congruent sides.
Perpendicular Lines
Two lines that intersect to form a right angle.
Straight Angle
An angle whose measure is exactly 180 degrees.
Supplementary Angles
Two angles whose measures have a sum of 180 degrees.