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# Unit 1 Exam Geometry

### Geometry

TermDefinition
Right Angle An angle that measures 90º.
Acute Angle Any angle that measures less that 90º.
Obtuse Angle Any angle that measures more than 90º.
Complementary Angles Any 2 angles that measure 90º when added up together.
Supplementary Angles Any 2 angles that measure 180º when added up together.
Vertical Angles Any set of lines that have equal sides
Linear Pair of Angles A set of angles that form 90º angles and are adjacent to each other.
Parallel Lines 2 lines that do not intersect each other.
Perpendicular Lines 2 lines that intersect and form a 90º angle.
Triangle 3 sides.
Pentagon 5 sides.
Hexagon 6 sides.
Septagon (Heptagon) 7 sides.
Octagon 8 sides.
Nonagon 9 sides.
Decagon 10 sides.
Unecagon 11 sides.
Dodecagon 12 sides
n-gon n sides.
Concave Polygon Lines fall outside of the shape.
Convex Polygon Lines fall inside the shape.
Polygon A closed shape with flat and connecting sides with more that 3 sides.
Diagonal A line that goes from 1 vertex to another non-consecutive vertex.
Equilateral Polygon A polygon in which all the sides are congruent.
Equiangular Polygon A polygon in which every angle is congruent.
Regular Polygon A polygon in which every angle and side is congruent.
Trapezoid A quadrilateral that has 2 parallel sides (or exactly 1 set of parallel sides).
Parallelogram A quadrilateral that has 2 sets of parallel sides.
Rhombus A quadrilateral in which both sets of sides are parallel and congruent.
Rectangle A quadrilateral in which every angle is 90º and there are 2 sets of parallel lines that are congruent.
Square A quadrilateral in which all of the sides are congruent
Chord A line segment that extends from 1 point of the circle to another point.
Diameter It is a line segment that passes through the center and extends to the other side. (It is the longest line segment
Radius It is a line segment that extends from 1 point of the circle to the center.
Tangent It is a line that intersect a curve or circle at only 1 point.
Congruent Circles Circles that have the same radius length.
Concentric Circles Circles that share the same center.
Semi Circle It is half of a circle
Minor Arc It always measures less than 180º.
Major Arc It always measures more than 180º.
Created by: stea124