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Geometry-8th Grade

Vocabulary

QuestionAnswer
Point An exact position in space
Line An infinite set of points forming a straight path in two directions
Line Segment A part of a line defined by two end points
Ray A part of a line that has one endpoint and extends indefinitely in one direction
Plane A flat surface that extends indefinitely in all directions
Angle Two rays that share an end
Right Angle An angle that measures exactly 90 degrees
Acute Angle An angle with a measure of less than 90 degrees
Obtuse Angle An angle with a measure of more than 90 degrees
Straight Angle An angle with a measure of exactly 180 degrees
Reflex Angle An angle that measures more than 180 degrees
Vertex The point at which two line segments, lines, or rays meet to form an angle
Congruent Having the exact same shape and size
Parallel Lines Always the same distance apart. They never intersect.
Perpendicular Lines Two lines forming right angles
Complimentary Angles 2 angles that add up to 90 degrees
Rectangle Quadrilateral with 2 pairs of opposite sides parallel and congruent and 4 right angles
Adjacent Angles Angles that are next to each other (share a vertex and a side between them)
Vertical Lines Opposite angles formed by intersecting lines
Rhombus Quadrilateral with 2 pairs of opposite sides parallel and all sides equal
Isoosceles Triangle with 2 sides equal
Equilateral Triangle with all sides equal
Quadrilateral 4-sided shape
Alternate Exterior Angles Angles on opposite sides of the transversal and outside the parallel lines
Hexagon 6-sided shape
Octagon 8-sided shape
Alternate Interior Angles Angles on opposite sides of the transversal and inside the parallel lines
Supplementary Angles 2 angles that add up toe 180 degees
Pentagon 5-sided shape
Decagon 10-sided shape
Vertex The point where an angle is formed
Parallelogram Quadrilateral with 2 pairs of opposite sides parallel
Scalene Triangle with no sides equal
Corresponding Angles "Matching Angles" In the same location on a different line
Trapezoid Quadrilateral with 1 pair of opposite sides parallel
Square Quadrilateral with 2 pairs of opposite sides parallel all sides congruent, and 4 right angles
Created by: smuehleisen