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# Math 9.5 - 9.7 Vocab

### Vocab for 9.5 - 9.7 Course 1

Point Usually labeled with an uppercase letter, such as A or B
Line Extends without end in two opposite directions
Ray Has one endpoint and extends without end in one direction.
Segment Has two endpoints
Plane A flat surface that extends without end in all directions
Two different lines Either intersect or are parallel
Intersecting Lines Meet at a point
Parallel lines Never meet
Angle Formed by two rays with the same endpoint
Vertex The angle; the point where two line segments meet.
Degrees Measurement of angles
Right angle An angle that measures 90 degrees
Acute angle An angle that measures below 90 degrees
Obtuse angle An angle that measures between 90 and 180 degrees
Straight angle An angle that measures exactly 180 degrees; looks like a straight line
Vertical angles Angles across from each other that have equal measures
Complementary angles two angles that add up to 90 degrees
Supplementary angles two angles that add up to 180 degrees
Triangle A closed plane figure with three straight sides that connect three points
Acute triangle has three acute angles
Right triangle has one right angle
Obtuse triangle has one obtuse angle
Equilateral triangle has three sides the same length
Isosceles triangle has at least two sides of the same length
Scalene triangle has three sides of different lengths
Quadrilateral A plane figure formed by 4 segments called sides
Parallelogram A quadrilateral with 2 pairs of parallel sides
Rectangle A parallelogram with 4 right angles
Rhombus A parallelogram with 4 sides of equal length
Square A parallelogram with 4 sides the same length and 4 right angles
Polygon closed figure that is formed by three or more segments called sides
3 sides Triangle