Points, Rays, Lines & Segments

Points, Rays, Lines & Segments

B

Point B

YX

Line Segment XY

XY

Line Segment YX

DC

Line Segment CD

MN

Line NM

NM

Line MN

BA

Ray AB

AB

Ray BA

Naming & classifying angles

Angles

An angle is formed when two rays have a common vertex.

An angle is made up of at least three points.

We can name and angle using a number or three letters

Angles

Let’s watch this quick video on naming angles:

http://www.khanacademy.org/math/geometry-1/core-geometry/v/angle-basics

Acute Angles

Measures less than 90 degrees

2

1< 2

< 1

Right Angle

Measures 90 degrees

Q R

P

< PQR or < RQP

QP

R

< RPQ or < QPR

Right Angle

Measures greater than 90 degrees

B

< 3

3

C

< ABC or <CBA A