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Browse Middle School TwoDimensional Geometry
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Classifying quadrilaterals.
Pythagorean theorem proofs.
 Transversal  Meaning and Examples [11/14/1994]

I have a 7th grade student who would like to know the meaning and
examples of "transversal".
 A Triangle with Three Right Angles [12/01/1999]

How can you make a triangle with three right angles?
 Trisecting a Line [11/03/1997]

How would you trisect a line using a compass and a straight edge?
 Trisecting a Line [01/30/1998]

How do I trisect a line using only a straightedge and compass?
 Trisecting a Line Segment [08/13/1999]

How can I measure onethird of a line of an unknown length using a
compass and a straightedge?
 Trisecting an Angle [4/16/1996]

I can bisect an angle easily but I can't trisect it perfectly. Would you
please send me instructions?
 Trisecting Angles [5/30/1995]

Can an angle be trisected?
 Trisecting a Right Angle [12/16/1996]

An explanation of how to trisect a 90 degree angle, plus some
constructions.
 Two Column Proof of a Theorem [08/12/1998]

Write a twocolumn proof and give numbered statements with reasons....
 The Unknown Angle that Didn't Matter [10/01/2014]

A geometry word problem leads to the confounding result 120° equals
0. Doctor Ian takes a closer look at how to interpret this puzzle's statement —
and empty solution sets generally.
 Using a Protractor [8/15/1996]

How do I measure angles using a protractor?
 Vertical Angle [11/15/2001]

What are vertical angles? Are they equal?
 Vertical Angles [10/27/1996]

What are vertical angles?
 What Are Proofs? [08/12/1997]

I am homeschooling and do not understand proofs. Can you help me out?
 What is a Jordan Curve? [06/07/2006]

What is a simple definition of a Jordan curve I can give my 5th graders?
 What is a point? [8/26/1996]

Define a point, please.
 What Is a Theorem and Why Are They Important? [08/15/1997]

I don't understand how theorems help us learn.
 What is a Vertex? [12/06/2001]

And what does vertices mean?
 What is Dimensional Analysis? [11/26/2001]

What is dimensional analysis and how does it work?
 What is Geometry For? [03/01/2002]

What is geometry really for?
 When Does 2D Become 3D? [01/20/2003]

Is a piece of paper a 3D object when held up in space? Or is it a 2D
object in 3D space?
 When is the expression Q.E.D. used? [02/15/1999]

More on Q.E.D.
 Why Cubed? [11/27/2001]

Why do we use "cubed" for the volume of a figure?
 Why is K Used as an Abbreviation for Area? [11/29/2004]

Many textbooks use the letter K to represent area in formulas, instead
of A. Do you know why that is?
 Why Proofs? Definitions and Axioms [09/16/2001]

Why are proofs important in the development of a mathematical system like
geometry?
 Why Study Tangrams? [10/27/1999]

How can a person use tangrams in the real world?
 World War II Window Blackout [10/21/2001]

Mr. Brown had a square window 120cm x 120cm, but the only material he
could find was a sheet of plywood 160cm x 90cm; same area, different
shape. He drew some lines and cut out just two congruent shapes, which he
joined to make a square of the correct size. How did he do it?
 Zero Degree and 360 Degree Angles [10/22/2003]

I am curious if there is such a thing as a zero degree angle, and if
so, what does it look like? I am also wondering if a zero degree
angle equals a 360 degree angle? I understand that a 360 degree angle
is essentially a circle, or the amount of 'turn' that equals a circle.
I am pondering how you would draw a 360 degree angle?
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