ecs 7th grade math

point

exact location in space

line

straight path that extends without end in opposite directions

ray

one endpoint extends with one direction without end

line segment

part of line or ray, extends from one endpoint to another

plane

perfectly flat surface; all directions

congruent

same shape and size

angle

2 rays; common endpoint

vertex

common endpoint

right angle

angle; exactly 90 degrees

acute angle

messures less than 90 degrees

obtuse angle

measures more than 90 and less than 180 degrees

straight angle

meaures 180 degrees

complementary angles

angles' sum measures 90 degrees

supplementary angle

angles' sum measures 180 degrees

parallel lines

line do not intersect; in the same plane

skew lines

do not intersect, not parallel; in different planes

vertical angles

opposite angles formed by 2 intersecting lines

transversal

intersect 2 or more than 2 lines