Math - Vocab + Formulas

Point

A location with no dimensions, notation is “point __”

Line

Any two points from a line. It extends forever. Notation is Line AB

Line Segment

Part of a line that has two endpoints. Notation is AB with line above.

Ray

Part of a line that has one endpoint while the other goes on indefinitely in one direction.

Plane

A flat surface made up of 3 points not in a line

Collinear Point

Points that lie on the same line

Coplaner Points

Points that lie on the same plane

Intersecting Lines

Form a point

Intersecting Planes

form a line

Segment Measures

The distance between points A and B can be donated as AB

Congruent Segments

If the measure of AB is equal to CD, then the segments are congruent (NOT equal)

What is the difference between the terms “congruent,” and “equal”

Congruent is the same size or shape, equal is the numerical value.

Segment Addition

If points A,B,C are collinear and B is between A and C, AB+BC=AC

midpoint of a segment

A point that divides a segment into two congruent segments

Segment Bisector

A line,ray, or segment that bisects a line segment.

Ticks

lines that prove a midpoint

Angle

A figure from found by two rays with common endpoints

Angle Measure

The rotation measure, in degrees from 1 ray to another.

Right Angle

a 90 degree angle

Obtuse angle

An angle more than 90 degrees

Acute Angle

An angle less than 90 degrees

Straight Angle

180 angle, straight

Vortex

common endpoint of an angle

Congruent Angles

if m<A=m<B then the angles are congruent

Angle Bisector

a ray that divides an angle into 2 congruent angles

Perpendicular lines

Two lines that intersect at a right angle

Pependicular Bisector

A line,seg, or ray perpendicular to a segment at its midpoitn

Angle Addition Postulate

If Point D is in the interior of <ABC then m<ABD+m<DBC=<ABC

What is the distance formula?

d= X2-X1 squared + Y2-y1 squared

What is the midpoint formula?

(Xm, Ym)-Midpoint (X1+X2/2) (Y1+Y2/2)

Vertical Angles

Two Angles across from each other on intersecting lines, always congruent

Adjacent Angles

two Angles next to each other and share a side

Complementary Angles

2 angles that add up to 90 degrees

Supplementary Angles

two Angles that add up to 180

Linear Pair

two Angles that are adjacent and supplementary