# mtbos math maths geometry msmath hsmath mathed edtech proof trig trigonometry precalc mathchat collegemath visualpattern patternlunch figurethat triangle theorem trianglesurprise science visualization elearning

Based on Pythagorean theorem

83 237
2019-11-08

What does it mean for a polygon to be CONVEX? CONCAVE? Here, a quick class opener using 2 different approaches: https://t.co/3M17XDndq2 Why tell Ss when they can explore themselves and tell us?

18 36
2019-10-31

Regular dodecagon - Dissection into 15 rhombs

6 12
2019-10-18

sin(2v) = 2*sin(v)*cos(v): Dynamic & modifiable illustration using equal areas. For a quick investigation for Ss (w/o ID appearing at the end): https://t.co/hIaGZcseR3.

65 150
2019-09-09

Playing around with pattern tiles again this morning and found something *super* cool!

I started by making this from ... (1/many)

6 11
2019-09-02

Here, a animation of 's problem posed earlier this week: https://t.co/bTIh6QYMcT.
How can we formally prove the sum of these 2 square areas = 4*R^2, no matter where the large points lie? 🤔

31 68
2019-08-30

Inspired by : For any RT, build a rectangle off its HYP so ratio of its L to W = 1:2. What is the measure of the pink angle? More importantly, WHY does this value NEVER CHANGE? https://t.co/wl2ZOWg42N

32 80
2019-08-25

SSS (Side-Side-Side) Congruence Dynamic via Transformational SAS & 1 other theorem. Question: Which one? 🤔 https://t.co/bdKZuzNJXK.

6 10
2019-08-23

When we build equilateral triangles off 2 sides of ANY TRIANGLE, another equilateral triangle surprisingly emerges! 😮 Why does this occur? 🤔Source: . Created with : https://t.co/lTfrId4Hik.

83 310
2019-08-16

Cycloids, the fastest path and other amazing properties 🚊🚊🚊
https://t.co/uDdBcmOgfb

156 369
2019-08-14

Similarity in Right Triangles: Dynamic Illustrations w/o Words. Created with : https://t.co/Tm8i9UPsgP. Shout out to for her suggestions to help me improve this 1st version: https://t.co/QZzxluxqsJ.

26 66
2019-08-13