Geometry - Vocabulary

Point

a dot with a capital print letter

Line

a line with two arrows, 2 capital print letters with a double sided arrow on top or a lowercase cursive letter

ray

a dot with a line and one arrow 2 capital print letters with a one sided arrow on top

segment

line with 2 dots at the end 2 capital letters with a line on top

plane

parallelogram with a capital cursive letter in a corner

midpoint

a dot in the middle of a segment

segment bisector

a thing (line, ray, segment, plane, etc.) that cuts a segment into 2 equal parts

angle

2 rays with the same starting point

vertex

corner of the angle

acute

an angle less than 90 degrees

obtuse

an angle greater than 90 degrees

right

90 degree angle

straight

an angle that's 180 degrees

angle bisector

a thing that cuts an angle into two equal parts

equal segments

2 segments that have the same measures

congruent segments

2 segments that have the same measure (without numbers)

equal angles

two angles that have the same measure (with numbers)

congruent angles

two angles that have the same measure (without numbers)

complementary angles

angles that add up to 90 degrees

supplementary angles

angles that add up to 180 degrees

linear pair

2 angles next to each other that make a line

vertical angles

formed by two intersecting lines they are the angles across from each other

collinear

points on the same line

coplanar

points on the same plane

parallel lines

lines on the same plane that don't intersect

perpendicular lines

lines that intersect to make a 90 degree angle

circle

all points equivalent from a single point