## Wednesday, November 9, 2011

### Trig! (almost)

Pam Patterson just sent me a link on twitter that's AWESOME. It's a list of assignments (with linked activities) that a teacher named David Pleacher gives to his precalc classes (who just coincidentally are using the same book that I do!).  Heaven.  I actually have quite a few of the resources he uses, but it's always nice to find some new ones!

We talked about the unit circle today in precalc - it's nice to be able to bring together all of the "random" things we've been doing the past week (like radians/degrees/special right triangles). I always like the kids to know where the ordered pairs on the unit circle come from, so I hand out notecards, we draw the special triangles to fit in our unit circle, label the sides, and voila!  The ordered pairs.  There's always the awkward moments where the kids are trying to see through their notecard to find the 30 degree angle so that they can draw the triangle.  Today (after doing this twice already... and multiple times for the past 10+ years) I had a revelation.  WHY NOT USE PATTY PAPER?  We have a ton of it (so I'm not scrounging up note cards) and it's see-throughable.  I can't believe this wasn't obvious to me years ago.  I grabbed a box from the math department office and used it 5th period without a hitch.

My Algebra 1 class finished up Barbie Bungee today... and boy, them working with Barbies was quite different than my Algebra 2 class. They looooved it.  Barbie had quite a few more accidents, though - and that was just on our walk to get to the final bungee location!  Needless to say, they were quite excited about our "field trip" to the football field for the big drop.

Factoring today in Algebra 2!

What a big day it's been.

#### 1 comment:

1. http://TrianCal.esy.es - Open in Google Chrome. (Triangles online calculator developed by Jesus S.)

I propose this free online calculator triangles without advertising to help students with geometry, does not perform the duties, because their calculations formulas are not displayed. It is designed in a didactic way to check and view the realized duties.

TrianCal is online calculator triangles that works with any combination of values including sides, heights, angles, the area or perimeter of any triangle, calculating it with the minimum possible value (typically three).

Other functions:
- Draw the triangle (s) with GeoGebra.
- Set the range of values in each element.
- The type of angle.
- The type of triangle by its angles and sides.
- Selection of language (English or Spanish).
- Select the angle type [degrees (°), radians, degrees, minutes and seconds (° ' ") or degrees and minutes (° ')].
- Number of decimal places shown in the results (0-15).
- You can use the arrow keys and the Tab key to navigate through the settings.
- Drop-down menu to select the values comfortably.
- Create a link (URL) to the current triangle.
- An icon mail to communicate with the author.

NOTE: You must use the Google Chrome browser to display correctly TrianCal.

Examples of possible combinations:
- The area, perimeter and other data (side, height or angle), if the outside equilateral triangle would not need the third data.
- 2 angles and other data (if the value of the other data is not put aside the value of "a" at the time of drawing the triangle is 10).
- One side, one high and one angle.
- 3 heights.
- 3 sides.
- 2 heights and perimeter.
- Any other combination of values.