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Acute Triangle

a triangle with three acute angles

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Obtuse Triangle

a triangle with one obtuse angle

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Right Triangle

a triangle with one right angle

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Equiangular Triangle

a triangle with three acute angles that are all 60 degrees

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Scalene Triangle

a triangle with no congruent sides

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Isosceles Triangle

A triangle with at least two congruent sides

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Equilateral Triangle

a triangle with three congruent sides

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Legs

the two congruent sides of an isosceles triangle or the two sides that form a right angle

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Hypotenuse

the side of a right triangle opposite the right angle

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Base

the non-congruent side of an isosceles triangle

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Base Angles

the two angles opposite the legs; they are congruent

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Vertex Angle

the angle opposite the base in an isosceles triangle

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