Other Basic Geometric Terms

Geometry Terms Lesson 2

More about Lines and Planes

Open Ended

What is the difference between a line and a line segment?

Collinear and Coplanar

• Collinear - a set of points that all lie on the same line

• Coplanar - a set of points that lie on the same plane 

Non-collinear and Non-coplanar

• non-collinear:  a set of points that are not on one line

• non-coplanar: a set of points that are not in the same plane

Multiple Choice

All of the following can be example of collinear EXCEPT?

Open Ended

Would you describe Point S in the picture as non-coplanar? Explain!

Angle Bisector and Midpoint

• Angle Bisector - A line that splits an angle into two equal angles. (cuts the angle in half)

• Midpoint -the point that is halfway between the endpoints of the line segment. (seperates the line into two equal parts)

Multiple Choice

If you bisect a 100 degree angle what would be the measure of the angle it creates?

• 40 and 60

• 55 and 45

• 50 and 50

• 70 and 30

Poll

Which point is the midpoint of this line segment in the diagram?

• A

• B

• C

• D

Skew Lines and Vertex

• Skew Lines - two or more lines which have no intersections but are not parallel

• Vertex - a point where two or more curves, lines, or edges meet.

Multiple Choice

What are all the vertices in the angles in the diagram?

• B and E

• C and D

• F and A

• A and D

Poll

Was operating these slides on your own difficult?

• Yes

• Somewhat

• No

What to do next?

Make sure you have completed your notes for today. Check Thursday's assignment link for assignment informations.