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34 Cards in this Set
 Front
 Back
an exact location

point


a straight path that extends without end in opposite directions

line


a flat surface that extends without end in all directions

plane


made up of two endpoints and all the points between the endpoints

line segment


has one endpoint. From the endpoint, it extends without end in one direction only

ray


measures less than 90 degrees

acute angle


measures 90 degrees

right angle


measures more than 90 degrees and less than 180 degrees

obtuse angle


the common endpoint of two rays

vertex


a triangle with all angles measuring less than 90 degrees

acute triangle


a triangle containing one obtuse angle

obtuse triangle


a triangle containing one right angle

right triangle


a triangle with no congruent sides

scalene triangle


a triangle with at least two congruent sides

isosceles triangle


a triangle with three congruent sides

equilateral triangle


a four sided polygon, or a plane with four sides and four angles

quadrilateral


a figure formed by two rays with a common endpoint called the vertex

angle


a quadrilateral with two pairs of parallel sides

parallelogram


a parallelogram with four right angles

rectangle


a parallelogram with all sides congruent

rhombus


an angle that measures 180 degrees

straight angle


a pair of opposite congruent angles formed by intersecting lines

vertical angle


two angles that are side by side and have a common vertex and ray

adjacent angle


two angles whose sum is 90 degrees

complementary angles


two angles whose sum is 180 degrees

supplementary angles


two lines that are opposite each other and never intersect

parallel lines


two lines that intersect to form a 90 degree angle

perpendicular lines


two lines on different planes and never intersect nor are they parallel

skew lines


a rectangle with four congruent sides

square


a quadrilateral with exactly one pair of parallel sides

trapezoid


a closed figure formed by three or more line segments that intersect only at their endpoints

polygon


having the same size and shape

congruent


are lines that cross at one common point

intersecting


is a polygon in which all sides are congruent and all angles are congruent

regular polygon
