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Trapezoid

A quadrilateral with one set of parallel lines, two acute angles, and two obtuse angles.

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Rhombus

A quadrilatertal with congruent sides.

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Square

A quadrilateral with congruent sides and 4 right angles.

A quadrilateral with four right angles.

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perpendicular lines

Lines that form right angles.

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Parallel lines

Lines that remain an equal distance apart.

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acute triangle

A triangle with all angles less than 90 degrees.

A triangle with an angle that measures exactly 90 degrees.

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obtuse triangle

A triangle with an angle that measures greater than 90 degrees.

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Protractor

A tool used for measuring angles.

A triangle that all sides have a different measurement.

A triangle with two congruent sides.

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equilateral triangle

A triangle with three congruent sides.

An angle that measures exactly 180 degrees.