| 1.) part of a line with one endpoint and extends without end in one direction |
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| 2.) two angles whose sum is 90 degrees |
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| 3.) two angles whose sum is 180 degrees |
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| 4.) a polygon with 3 sides |
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| 5.) two rays with a common endpoint |
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| 6.) a triangle with exactly one right angle |
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| 8.) a triangle with one obtuse angle |
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| 10.) a triangle with two congruent sides |
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| 11.) a triangle with no congruent sides |
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| 12.) a closed figure made up of 3 or more line segments. |
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| 13.) a polygon with four sides |
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| 14.) a quadrilateral with both pairs of opposite sides parallel |
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| 7.) a triangle with 3 acute angles |
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| 15.) a quadrilateral with exactly one pair of parallel sides |
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| 16.) a parallelogram with four congruent sides |
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| 17.) a rectangle with four congruent sides |
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| 18.) a parallelogram with four right angles |
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| 19.) a trapezoid with two congruent non-parallel sides |
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| 20.) a trapezoid with two right angles |
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| 9.) a triangle with three congruent sides |
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Famous Foursomes
'A' Game
Common Passwords
