I post mostly messages and commentary about religion and politics, and the scary occasions when they collide.
I am a: Liberal, Green, Christian, Math teacher
Lover of Math, Philosophy, Animals, Civil Rights, and Arguments of all kinds.

29th September 2012

Post with 6 notes

Geometry is easy before you study it

How I would teach geometry were I not using a school-approved teaching series:

-There are only three shapes in all the world, and thus, only three formulas for area that you ever have to memorize: triangles, rectangles, and circles. Two-dimensional, three-dimensional, area, volume- doesn’t matter. There are only three shapes.

Really, once you realize that a triangle is just a rectangle cut in two equal pieces, there are only two formulas.

I remember hating geometry in high school because it seemed like a bunch of arbitrary formulas to put numbers into. Then I took 4 semesters of Calculus and realized that knowing those formulas was completely and utterly ridiculous(which is why Calculus will always be the best of the maths). I hate this series and the way it acts like throwing a bunch of variables around is somehow making it easier for students to understand how to find area, and written by a non-math guy who I don’t think understands geometry and relationships between shapes nearly as well as he thinks he does.

Sigh. I should write my own math book/theory on how to teach math. Then I can stop dealing with actual students and go into the business of telling other teachers how they’re doing it wrong. Mmm…

Tagged: mathteachingcalculus is greatgeometry

  1. liberalchristian posted this