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Point

a geometric element that has position but no extension

line

a straight path that extends without end in opposite directions

collinear

points that lie on the same line

non collinear

points that do not lie on the same line

ray

extend or spread outward from a center or focus or inward towards a center

end point

The point at the segment or ray

segment

part of a line

plane

an unbounded two-dimensional shape

parallel lines

coplanar lines that do not intersect

intersecting lines

lines that cross at one point

perpendicular lines

Lines that intersect to form right angles

skew lines

lines that lie in different planes. they are neither parallel or intersecting

midpoint

a point that divides a segment into two congruent segments

congruent segments

Segments that have the same length

angle

two rays with a common endpoint

vertex

The common endpoint of an angle

protractor

drafting instrument used to draw or measure angles

degrees

used to measure temperature, latitude, longitude, right ascsension, and declination

congruent angles

Angles that have the same measure

right angles

angles that measure 90 degrees

obtuse angles

angles more than 90 degrees

acute angles

angles that are less than 90 degrees

complementary angles

Two angles whose sum is 90 degrees

supplementary angles

Two angles whose sum is 180 degrees