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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.