24 terms

Tools of Geometry for students to understand the basics of Geometry used in Common Core Math 1 at the high school level.

Point

Indicates location and has no size

Line

Straight path that extends in two opposite directions without end

Plane

A flat surface that extends without end, no thickness, and contains infinite number of points

Segment

Part of a line that consists of two endpoints and all points between them

Ray

A part of a line that consists of one endpoint and all the points of the line on one side of the endpoint

Opposite Rays

Two rays on a plane that share the same endpoint and form a line

JK

The length of segment JK

Segment Addition Postulate

ED + DF = EF

Segment Congruence

Midpoint of a Segment

Segment Bisector

Angle

Formed by 2 rays with the same endpoint

m∠T

The degree measure of the angle

Acute Angle

Right Angle

Obtuse Angle

Straight Angle

Congruent Angles

Angle Addition Postulate

Adjacent Angles

2 coplanar angles with a common side and a common vertex

Vertical Angles

Two angles whose sides are opposite rays

Complementary Angles

Two angles whose measures have a sum of 90⁰

Linear Pair

Pair of adjacent angles whose noncommon sides are opposite rays. They will be supplementary.

Supplementary Angles

Two angles whose measures have a sum of 180⁰