## Geometry Files: More Triangles? Are you serious?

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Yes, I’m totally serious.  (see more files and FAQs here)

But we already did triangles, you say. Sure, we looked at congruent triangles, but did we look at stuff that can happen inside triangles?!?!  There’s a lot of good discovery activities for these rules, also here are some rudimentary geogebra files I made:

(files: medians, perpendicular bisectors, angle bisectors) then we can solidify everything:

(file here) Oh, plus there’s this weird thing about medians:

I make mine draw out and label the median for each problem; the visual seemed to help a lot of them see the relationship between what was given and what we need.

Homework:

Then let’s put all this together!

(file here) “Boy, Meg, sure wish there was a powerpoint to go along with this!”  Why, it’s your lucky day!

Then another powerpoint for exterior/interior angle and angle/side inequalities:

Then I guess I did more stuff with possible sides of a triangle?  Then some practice:(file here) wiiiiiiiith powerpoint!

And more inequalities!!

ARE WE DONE WITH THESE TRIANGLES YET?!?!?!?!

Yes!  Now just a review!

(file here) and powerpoint:

Finally!  There can’t be anything else we can do with triangles, right?!?!  (Shh…we won’t talk about trig coming up, ok?)

Category: Geometry | Tags: ,

## Giving Geometry Some Love: Definitions & Logic/Proofs

It’s been about 3 years since I taught Geometry and there are people doing a lot more creative and deep-thinking stuff than myself  (see: Jim, Julie, Lisa, Mimi, Shireen, and many others), but ugh, having to draw a geometry diagram in Word?

(Hint: draw it in Geogebra, then use the snipping tool to grab it and insert, but even then it’s a pain).  So just to save you some time and hassle, I’ll also be trying to share my Geometry files this summer; stay tuned to this page!  Since it has been three years, much of it will be presented without comment. 🙂

Ah, the dreaded first chapter full of definitions. I guess I hated it so much I didn’t keep many files, but here’s what I do have:

Oh, here’s one thing I’ve done that’s pretty creative: I made my own Angle Awesomeness Rap  (I used to have a bit of a commute and planned it out on my drive one day).  It even has a snazzy powerpoint:

(file here) And NoteTakerMaker:

File here. Yeah, I know, I’m the next Beyonce.

Then I guess I did some sort of other work, and then a review

Now for Chapter 2: Logic and Proofs.  First up, logic! With symbols! And lots of corgi references!

Now…dun dun dunnnnnnn….. PROOFS!  First, some properties:

File here. And hey, let’s figure out what we know from givens:

And then remind ourselves that We Can Figure Things Out (without a formal proof yet):

Then, we do the same problems with some proof handholding:

File here (and yes, the file has proofs for all 5 problems).

Then finally (finally!) we can start on some real from-scratch proofs:

File here. Also, look below at me being clever with using “G.I.F.T.” for proofs!  And also Color With A Purpose.  I also tell them that you should use every line in a proof, which is what the arrows are for.  It seems to help if they’re stuck, “Well, is there anything you haven’t used yet?”

And also step-by-step powerpoints for the study guide!

But I’m guessing we didn’t do so well on the test, as there is a “repractice” worksheet

And powerpoint:

So maybe now instead of making that 417th drawing in word, you can copy and paste from these and then:

Right?

Category: Geometry | Tags: , , , ,