math

point

an exact location in space

line

a straight path that extends without end in opposite direction

ray

a part of a line; has one end point and extends without end in one direction

line segment

a part of a line or ray that extends from one end point to another

plane

a perfectly flat surface that extends infinatly in all directions

congruent

two figures having the same shape and size

angle

two rays with a common end point

vertex

end point

right angle

an angle that measures exactly 90 degrees

acute angle

an angle that measures less than 90 degrees

obtuse angle

an angle that measures more than 90 degrees but less than 180 degrees

straight angle

an angle that measures exactly 180 degrees

complementary angles

sum of the measure of two angles is 90 degrees

supplementary angles

sum of the measure of two angles is 180 degrees

perpendicular lines

angles formed by two intersecting lines are equal to 90 degrees

parallel lines

lines that do not intersect; in the same plane

skew lines

do not intersect but are not parallel; different planes

vertical angles

opposite angles formed by two intersecting lines

transversal

a line that intersects two or more lines