The Math Forum

Ask Dr. Math - Questions and Answers from our Archives
Associated Topics || Dr. Math Home || Search Dr. Math

Six Lines Make Twelve Triangles

Date: 11/06/2002 at 16:09:14
From: Thomas Aliberti
Subject: Middle school math

How can I use 6 lines to make 12 triangles? I cannot get this to work.

Date: 11/06/2002 at 20:13:44
From: Doctor Sarah
Subject: Re: Middle school math

Hi Thomas - thanks for writing to Dr. Math.

See if this is what you're trying to do:


The hard part isn't making the drawing so much as counting the 

- Doctor Sarah, The Math Forum 

Date: 11/06/2002 at 20:37:11
From: Thomas Aliberti
Subject: Thank you (Middle school math)

Thank you very much. It is so easy once you see the resolution. I will 
take the diagram to my math teacher tomorrow to share with the class.
Associated Topics:
Elementary Puzzles
Elementary Two-Dimensional Geometry
Middle School Puzzles
Middle School Two-Dimensional Geometry

Search the Dr. Math Library:

Find items containing (put spaces between keywords):
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

Submit your own question to Dr. Math

[Privacy Policy] [Terms of Use]

Math Forum Home || Math Library || Quick Reference || Math Forum Search

Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.