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Geometry Unit Vocab

Geometry Unit Vocabulary

TERMDEFINITION
POINT An exact location in space
LINE A straight arrangement of points that extends forever in opposite directions
LINE SEGMENT A part of a line that consists of two endpoints and all the point between
RAY A straight arrangement of points that extends forever in one direction
PLANE A flat surface that extends forever
ANGLE The figure formed when two rays share a common endpoint
VERTEX The point where two rays (or line segments) meet
SIDES OF AN ANGLE The rays that form an angle
DEGREE The unit commonly used to measure the size of an angle
PROTRACTOR A geometric tool used to measure an angle
ACUTE ANGLE An angle with the measure greater than 0° and less than 90°
RIGHT ANGLE An angle with the measure equal to 90°
OBTUSE ANGLE An angle with the measure greater than 90° and less than 180°
STRAIGHT ANGLE An angle with the measure equal to 180°
PARALLEL LINES Two lines in the same plane that do not intersect
PERPENDICULAR LINES Two lines that intersect to form right angles
SKEW LINES Two lines in different planes that do not intersect
INTERSECTING LINES Lines that meet or cross each other at one point
VERTICAL ANGLES When two lines intersect, the angles that are not next to each other
CONGRUENT Equal in measure
ADJACENT ANGLES When two lines intersect, the angles that are next to each other
COMPLEMENTARY ANGLES Two angles for which the sum of their measure is 90°
SUPPLEMENTARY ANGLES Angles for which the sum of their measure is 180°
TRANSVERSAL A line that intersects two parallel lines
CORRESPONDING ANGLES Angles that occupy the same relative position
SCALENE TRIAGLE A triangle in which no sides are the same length
ISOSCELES TRIANGLE A triangle in which two sides are the same length
EQUILATERAL TRIANGLE A triangle in which three sides are the same length
ACUTE TRIANGLE A triangle in which all angles are acute angles
RIGHT TRIANGLE A triangle in which one angle is a right angle
OBTUSE TRIANGLE A triangle in which one angle is an obtuse angle
CIRCLE A closed, curved shape in which all points on the circle are equal distance from the center
TRIANGLE A polygon with three sides
QUADRILATERAL A polygon with four sides
PARALLELOGRAM A quadrilateral with two pairs of parallel sides
RECTANGLE A quadrilateral with two pairs of parallel sides and four right angles
RHOMBUS A quadrilateral with two pairs of parallel sides and four sides of equal length
SQUARE A quadrilateral with two pairs of parallel sides, four right angles, and four sides of equal length
TRAPEZOID A quadrilateral with one pair of parallel sides
PENTAGON A polygon with five sides
HEXAGON A polygon with six sides
HEPTAGON A polygon with seven sides
OCTAGON A polygon with eight sides
NONAGON A polygon with nine sides
DECAGON A polygon with ten sides
Created by: Miss Kinman
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