Geom H Unit 1 vocab

segment bisector

a segment, ray, line, or plane that intersects a segment at its midpoint

Linear pair

Two adjacent angles that add up to 180

Adjacent Angles

Angles that have a common side and a common vertex (corner point).

Midpoint

A point that divides a segment into two congruent segments

Straight Angle

an angle that measures 180 degrees

Angle bisector

a ray that divides an angle into two congruent angles

point

A location in space. represented by a capital letter

Supplementary angles

Two angles whose sum is 180 degrees

Complementary angles

Angles that add up to 90 degrees

Vertical angles

A pair of opposite congruent angles formed by intersecting lines

line

Straight path that extends into two opposite directions without end. Two capital letters on a lowercase letter.

plane

Flat surface that extends without end. Named by 3 NONcollinear points or a capital letter.

collinear

points that lie on the same line

coplanar

points that lie on the same plane

ray

A part of a line, with one endpoint, that continues without end in one direction

segment

formed by two rays with the same endpoint

opposite rays

two rays that have a common endpoint and form a line

congruent

Having the same size and shape

acute angle

less than or 90 degrees

obtuse angle

more than 90 degrees

right angle

an angle that measures 90 degrees

angle

A figure formed by two rays with a common endpoint

Ruler postulate

The points on any line or line segment can be put into one-to-one correspondence with real numbers.

Segment addition postulate

If B is between A and C, then AB + BC = AC

Linear pair postulate

If 2 angles form a linear pair, then they are supplementary

Area addition postulate

The area of a region is equal to the sum of the areas of its nonoverlapping parts.

Still learning (7)

You've started learning these terms. Keep it up!