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Definitely Definitions
Points, Lines and Planes
Based on the picture
Keep Defining
Postulates
100
part of a line containing two endpoints and all points between them.
What is Line Segment
100
one of the three "undefined terms" in Geometry having only position
What is Point
100

Two angles whose sum is 90 degrees.

What are Complementary Angles?

100
Two segments with the same length
What are Congruent Segments
100

These determine exactly one line

Two Points

200
part of a line that consists of one endpoint and all points of the line extending in one direction
What is a Ray
200
one of the three "undefined terms" in geometry having only length (one dimension)
What is Line
200

A segment of the circumference of a circle.

What is a Circular Arc

200
an angle that measures more than 90 degrees
What is an Obtuse Angle
200

When two planes intersect, their intersection forms this.

A Line

300

An angle whose measure less than 90 degrees.

What is Acute Angle?

300
one of the three "undefined terms" in geometry having length and width but no depth (two dimensions)
What is Plane
300

A line segment whose endpoints lie on the circumference of a circle.

What is a chord? 

300

An angle that measures less than 90 degrees

What is an acute angle

300

A triangle in which each angle measures less than 90 degrees. 

What is a Acute Triangle?

400
a pair of rays that share a common endpoint
What is an Angle
400

Two angles in the same plane that share a common vertex and a common ray.

What are Adjacent Angles?

400

 A rectangular arrangement of objects or number in rows and columns.

 What is Array? 

400
an angle that measures 90 degrees
What is a Right Angle
400

This is formed where two lines intersect.

A Point

500

Two rays that have the same endpoint but go in the opposite direction

What are opposite rays

500

A two-dimensional figure quality representing the amount of space in a surface

What is the area?

500

 This is a line with two end points.  It doesn't not travel forever.  

 What is a line segment. 

500

 A set of points in a plane equidistance from a given point (i.e. center).  A closed plane curve generated by the trace of a point moving in such a way that its distance from a fixed point remains constant. 

 What is a circle? 

500

The number of points on a line

What is Infinite (unlimited)?