Basic Terminology (Geometry)

___________ are lines that lie in the same plane

• Coplanar Lines

• Line Segment

• Collinear Points

• Intersection

Points on the same line are __________ points

• Coplanar

• Coordinate

• Conjecture

• Collinear

A straight figure having no thickness and extending infinitely in both directions

• line

• ray

• point

• straight angle

A line with a single endpoint (or point of origin) that extends infinitely in one direction

• line

• ray

• point

• straight angle

Tell which ones are correctly written, assuming that segment AB is the same length as segment CD. Select all that apply.

Tell which ones are correctly written, assuming angle 1 has the same measure as angle 2.

Which geometric "undefined" term has no dimensions and is represented by a dot?

• point

• line

• plane

Which of the following is NOT shown in the picture?

What is the measure of angle D in degrees?

Classify this angle.

• acute

• right

• obtuse

• left