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Transformation

An operation that changes one figure into another figure.

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Reflection

A transformation that creates a mirror image of a figure

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Translation

A transformation that slides a figure

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Dilation

A transformation that stretches or shrinks a figure

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Obtuse Triangle

A triangle with one angle greater than 90 degress

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Scalene Triangle

A triangle with no congruent sides

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Rhombus

A parallelogram with 4 congruent sides

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Parallelogram

A quadrilateral with both pairs of opposite sides parallel

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Quadrilateral

A closed geometric figure made up of 4 line segments, called sides, that intersect only at their endpoints

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Regular Polygon

A polygon with all sides equal in length and all angles equal

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Polygon

A closed figure whose sides are line segments that intersect only at their endpoints

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Pentagon

A polygon with 5 sides

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Octagon

A polygon with 8 sides

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Congruent Segments

Segments that have the same length

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Congruent Angles

Angles that have equal measures

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Heptagon

A polygon with seven sides.

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Complementary Angles

Two angles whose measures have a sum of 90 degrees.

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Line Symmetry

A figure that when cut in half has a mirror image of the other half.

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Parallel

Two lines on the same plane that never intersect.

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Equilateral Triangle

A triangle with three congruent sides.

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Acute Angle

An angle whose measure is less than 90 degrees.

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Right Angle

An angle whose measure is exactly 90 degrees.

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Trapezoid

A quadrilateral with exactly one pair of parallel sides.

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Isosceles Triangle

A triangle with at least two congruent sides.

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Perpendicular Lines

Two lines that intersect to form a right angle.

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Straight Angle

An angle whose measure is exactly 180 degrees.

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Supplementary Angles

Two angles whose measures have a sum of 180 degrees.

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