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| An angle greater than 90° and less than 180° |
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Angles that share a common side and have the same vertex.
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| When opposite angles are formed by the intersection of two lines |
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| Angles with the same measure |
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| When the sum of two angles measures 90° |
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| When the sum of two angles measures 180° |
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| A triangle with all acute angles |
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| A triangle with 1 obtuse angle |
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| A triangle with 1 right angle |
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| A triangle with 3 congruent angles |
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| Sides that have the same length |
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| Sum of the Angle Measures of a Triangle |
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| A polygon with four sides |
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| A quadrilateral with exactly one pair of parallel sides |
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| A quadrilateral with opposite sides that are parallel and congruent |
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| A quadrilateral with two pairs of congruent adjacent sides and opposite sides that are not congruent |
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| A parallelogram with four right angles |
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| A parallelogram with four congruent sides and four right angles |
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| A parallelogram with four congruent sides |
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| Sum of the Angle Measures of a Quadrilateral |
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| A proportional, two-dimensional drawing of an object |
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| A proportional, three-dimensional model of an object |
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| The ratio that compares the measurements of the drawing or model with the actual measurements |
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