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## Three Acute angles

Acute Triangle

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## Three Congruent Acute Angles

Equiangular Triangle

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## One right angle

Right Triangle

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## One obtuse angle

Obtuse Triangle

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## three congruent sides

Equilateral Triangle

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## At least two congruent triangles

Isosceles

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## No congruent sides

Scalene Triangle

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## a line that is added to a figure to aid in proof

Auxiliary Line

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## angle formed by two sides of a triangle

Interior Angle

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## an interior angle that is not adjacent to the exterior angle

Remote interior Angle

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## Angles in the same position in polygons with an equal number of angles

Corresponding Angles

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## Sides in the same position in polygons with an equal number of sides

Corresponding Sides

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## If and only if their corresponding angles and sides are congruent

Congruent Polygons

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## Gives you a shortcut for providing 2 triangles are congruent

Triangle Rigidity

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## an angle formed by 2 adjacent sides of a polygon

Included Angle

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## the common side of 2 consecutive angles in a polygon

Included Side

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## the 2 angles that have the base as a side

base angles

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