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Geometry Unit Vocab

For Zoe; Tutoring Session

Acute Angle An angle that measures less than 90 degrees
Acute Triangle A triangle that has all angels less than 90 degrees
Adjacent Angles Two angles that have a common vertex and don't overlap
Decagon A polygon with 10 sides
Degree A measure for angles. There are 360 degrees in a full rotation. The symbol for degrees is °.
Endpoint The two furthest points on a line segment
Equilateral Triangle A triangle with all three sides of equal length. All of the angles in it measure 60°
Hexagon A polygon with 6 sides
Intersecting Lines Lines that cross over and have a common point
Isosceles Triangle A triangle with two equal sides. The angles opposite of the equal sides are equal
Line Straight, has no thickness, and extends in both directions without end
Line of Symmetry A line where you could fold a shape and have both sides match exactly
Line Segment The part of a line that connects two points
Obtuse Angle More than 90° but less than 180°
Obtuse Triangle A triangle that has one angle greater than 90°
Octagon A polygon with 8 sides
Parallel Lines Lines that never meet. They are the same distance apart
Parallelogram A quadrilateral where opposite sides are parallel
Pentagon A polygon with 5 sides
Perpendicular Lines lines that are at right angle to each other
Point An exact location. It has no size, only location
Protractor A measuring tool used to measure or draw angles
Quadrilateral A two-dimensional shape with four straight sides
Ray A part of a line with a start point but no end point
Rectangle A two-dimensional shape with straight sides where all inside angles are right angles
Rhombus A two-dimensional shape with 4 straight sides that are all equal length. It's a type of parallelogram
Right Angle Equal to 90° and is one quarter of a full rotation
Right Triangle A triangle that has one right angle
Scalene Triangle A triangle with all sides of different lengths. No sides or angles are equal
Square A quadrilateral where all sides have equal length and every angle measures 90°
Symmetry When two or more parts are identical after a flip, slide, or turn
Trapezoid A quadrilateral that has one pair of opposite sides parallel
Vertex A point where two or more line segments meet. It can also be referred to as a corner
Vertices the plural form of vertex
Created by: 1L
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