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### 28 Cards in this Set

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 Point a. Most basic term in geometry, (undefined) b. A location c. Represented by a capital letter Line a. Infinite number of points extending in a continuous straight line b. A line is determined by 2 points c. Line has 1 dimension – length d. Can’t measure a line Plane Flat Surface with continuous length and width Collinear Two or more points on the same line Line Segment a. A subset of a line that has an endpoint b. Can measure a line segment Ray a. A subset of a line containing one endpoint b. Extends infinitely in one direction Congruent Segments Two or more line segments that are the same size Midpoint A point that divides a line segment into 2 congruent segments Definition A statement that explains or clarifies the meaning of a word or phrase Coplanar On the same plane Angle a. A geometrical figure that consists of two rays with a common endpoint (vertex) b. Must put “<” in front of and angle’s name c. Example: < SBC i. The middle letter is always the letter that goes in the middle of the angle Angle Bisector A ray from the same vertex of an angle and creates two congruent angles Counter Example Something that fits the definition but isn’t what you were trying to describe Right Angle An angle that measures exactly 90 degrees Acute Angle An angle that measures less than 90 degrees Obtuse Angle An angle that measures greater than 90 degrees Pair of Vertical Angles Two non-adjacent angles that are formed by two intersecting lines Linear Pair of Angles Two adjacent angles whose measures add to 180 degrees Pair of Complementary Angles Two angles whose measures add up to 90 degrees Pair of Supplementary Angles Two angles whose measures add up to 180 degrees Parallel Lines Lines in the same place that never miss (symbol ll) Perpendicular Lines Lines that meet at 90 degree angles Diagonal A line segment that connects two non adjacent vertices Convex Polygon A polygon where all the diagonals fall inside the polygon Concave Polygon A polygon where at least one diagonal falls outside of the polygon Congruent Polygons Polygons are congruent if only their corresponding sides and angles are congruent Equilateral Polygon A polygon that has all congruent sides in length Equiangular Polygon A polygon in which all the angles are congruent