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| two different rays that share the same endpoint; the endpoint is called the vertex |
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| two angles that have a common vertex and a common side, but no common interior points |
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| alternate interior angles |
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| angles that lie on the same side of the transversal and in corresponding positions |
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| angles that lie on the same side of the transversal and in corresponding positions |
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| the two opposite angles formed by two intersecting lines; have the same measure so they are congruent |
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| if the sum of the measure of two angles is 180° |
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| if the sum of the measure of two angles is 90° |
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| lines in the same plane that never interesect |
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| two lines that intersect to form right angles; right angles had 90°; the symbol,l_, is used in diagrams to denote a right angle |
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| a line that intersects two other lines at different points |
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| (~=) figures that have the same size and same shape |
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| figures that have the same shape but not the same size |
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| the number of square units a figure encloses |
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| the distance around a figure |
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| a straight sided, closed figure (at least three sides) |
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| a polygon with all the sides congruent and all the angles congruent |
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| triangle with 3 angles smaller than 90° |
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| a triangle with 3 congruent sides |
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| a triangle that has at least two congruent sides |
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| a triangle with one angle larger than 90° |
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| a triangle with one angle of 90° |
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| a triangle with no congruent sides |
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| a quadrilateral with only one pair of parallel sides |
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| a quadrilateral with 2 parallel sides |
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| a parallelogram with 4 right angles |
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| a parallelogram with 4 congruent sides |
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| rectangle with 4 congruent sides or a rhombus with 4 right angles |
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