Triangle - Polygon with 3 sides, Quadrilateral - Polygon with 4 sides, Pentagon - Polygon with 5 sides, Hexagon - Polygon with 6 sides, Heptagon - Polygon with 7 sides, Octagon - Polygon with 8 sides, Nonagon - Polygon with 9 sides, Decagon - Polygon with 10 sides, Dodecagon - Polygon with 12 sides, Regular Polygon - Polygon with congruent sides and angles, Equilateral Triangle - Triangle with 3 congruent sides, Isosceles Triangle - Triangle with 2 congruent sides, Scalene Triangle - Triangle no congruent sides, midpoint - a point that cuts a segment into 2 congruent parts, bisector - a point, ray or line that cuts a segment or angle into 2 congruent parts, Parallel lines - lines that never intersect, Perpendicular lines - lines that form right angles, Acute Angle - Angle measuring less than 90 degrees, Right Angle - Angle measuring exactly 90 degrees, Obtuse Angle - Angle that is greater than 90 degrees but less than 180, Straight Angle - An angle that measures exactly 180 degrees, Adjacent angles - Two angles that are next to each other and share a common side, Complementary Angles - any two angles whose sum is 90 degrees, Supplementary Angles - any two angles whose sum is 180 degrees, Linear Pair - two angles that are supplementary and adjacent. (They form a straight line), Vertical Angles - Two angles across from each other on intersecting lines. They are always congruent., Alternate Interior Angles - Formed by parallel lines, they are congruent. They are inside the parallel lines and on opposite sides of the transversal , Alternate Exterior Angles - Formed by parallel lines, they are congruent. They are outside the parallel lines and on opposite sides of the transversal., Same Side Interior angles - Formed by parallel lines, they are supplementary. They are inside the parallel lines and on the same side of the transversal., Same Side Exterior angles - Formed by parallel lines, they are supplementary. They are outside the parallel lines and the same sides of the transversal,

Unit 1 Intro to Geometry Vocab

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