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each of the pairs of opposite angles made by two intersecting lines

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a triangle that has 3 congruent sides

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four-sided shape that is made up of four straight sides that are the same length and that has four right angles

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a four-sided shape that is made up of two pairs of parallel lines and that has four right angles

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A triangle that has an angle greater than 90 degrees and less than 180 degrees

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when two angles share a common side and have the same vertex

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a triangle that is equal to 90 degrees

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a triangle that is less than 90 degrees

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a quadrilateral whose four sides can be grouped into two pairs of equal-length sides that are adjacent to each other

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a triangle that has two sides of equal length

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either of two angles whose sum is 180°

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a simple quadrilateral with two pairs of parallel sides

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a triangle that has three unequal sides

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a triangle where all three interior angles are equal in measure

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a four-sided shape that has two sides that are parallel and two sides that are not parallel

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two angles that add up to 90 degrees

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a shape with four sides that are equal in length and with four angles that are not always right angles

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a flat shape that has four sides and four angles