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Definitely Definitions
Points, Lines and Planes
What is that?
Keep Defining
Shapes
100

part of a line containing two endpoints and all points between them.

What is a Line Segment

100

one of the three "undefined terms" in Geometry having only position

What is a Point

100
a closed figures with more than three sides and angles
What is a Polygon
100

the geometric word for "equal" in size

What is Congruent

100

the number of points on a line

Infinitely Many

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 a Line

200

a shape with a center, a radius, and a diameter

What is a Circle

200

lines not on the same plane (surface) that do not intersect

What are Skew Lines

200

a shape with eight sides

What is an Octagon

300

the middle of a line segment

What is a Midpoint

300

one of the three "undefined terms" in geometry having length and width but no depth (2D flat surface)

What is a Plane

300

a triangle with all equal sides 

What is an Equilateral Triangle

300

an angle with less that 90 degrees

What is an Acute Angle

300
two angles that add of up to 180 degrees

What are Supplementary Angles

400

a pair of rays that meet at their endpoints

What is an Angle

400

lines that intersect to form right angles

What are Perpendicular Lines

400
a quadrilateral that is equilateral and equiangular
What is a Square
400
an angle that measures 90 degrees
What is a Right Angle
400

a ten sided shape

What is a decagon

500
two angles whose measures have sum 90
What are Complementary Angles
500

lines that never cross

What are Parallel Lines

500
a triangle with no sides the same length
What is a Scalene Triangle
500
an angle that measures more than 90 degrees
What is an Obtuse Angle
500

a five sided shape

What is a Pentagon