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The common external tangent segment connecting any 2 tangent circles has a length equal to the GEOMETRIC MEAN of the radii of both circles. 😯 How to prove? 🤔(Source: ). https://t.co/3RwqD4ki5M

26 73
2019-08-05

Suppose V = a triangle vertex, I = incenter, O = orthocenter, & C = circumcenter. Then ray VI ALWAYS BISECTS angle OVC! How can we formally prove this phenomenon true? (Source: ). https://t.co/rYmoDjwCNy

28 84
2019-08-03

Do you think you know everything about squares...?

Van Aubel's Theorem: the two segments are perpendicular and of equal length

https://t.co/Nhcf38z3qe

40 133
2019-07-30

Here, we have a right triangle with its incircle, excircle, & points of tangency to be shown. How can we prove the collinearity among the 3 points (shown at the end)? (Source: ). https://t.co/CGNxP7i5Hz

16 32
2019-07-30

Ts: Want to engage your Ss in active modeling fun? 3D has all the tools you need! And we can use to test modeling accuracy! 🙂 Re: getting started: https://t.co/tVhsrPTAcV.

12 49
2019-07-16

Exploring cube w/in in a beta version of coming soon to both & platforms. Love how we’ll be able to plot the intersection of both from INSIDE THE 😮

9 27
2019-07-02

with can help make these ACTUAL REALITIES in our classes. If we live in a 3d world, why remain only in the 2D CP? https://t.co/tVhsrPTAcV

2 11
2019-06-17

Morley's Theorem - Dynamic & modifiable illustrator w/o words: https://t.co/se5j3nEutR. How to prove? 🤔

16 47
2019-05-18

More REGULAR NONAGON wonders (inspired by ). What is the measure of the PINK ANGLE here? For a surprise-cameo-appearance-hint, see https://t.co/PPTBT7rkhB.

7 9
2019-05-15

Dynamic & Modifiable Illustrator (w/o words) Not sure why many texts make this into such "thing" (by calling it a corollary or another theorem). Isn't the original theorem good enough?🤔 https://t.co/9L3SvzdyLS

14 38
2019-05-08

Sum of Measures of a Polygon's Exterior Angles: Alternate modifiable & dynamic illustrators. Explore here: https://t.co/zXdRkaQEym.

7 17
2019-05-03

The Chromebook Classroom Podcast: Teaching Math with Chromebooks https://t.co/0DpC4LvuAT

3 1
2019-04-30

Equilateral Triangle to 30-60-90 Triangle (w/o words). resource includes key guiding Qs for Ss: https://t.co/mP2kbI1PJz.

45 97
2019-04-30

Similarity in Right Triangles: Exploration & Discovery w/Key Qs for Ss: https://t.co/Tm8i9UPsgP. What relationships are shown here? (T/Y to for her suggestions to improve https://t.co/QZzxluxqsJ).

19 50
2019-04-29

Polygon Angle Theorems: N = 3 (triangle) through N = 8 (octagon). Dynamic & modifiable illustrators (w/o words): https://t.co/9rPS0hGhQs. (BGM: ).

48 125
2019-04-29

Happy To celebrate, explore some fun and educational activities created by teachers, for teachers with From to to & there's an activity for any subject and grade! https://t.co/oyo7eufeyL

3 3
2019-04-23

Looks like -dabbling is starting to grow on me. 🙂 What theorem is being illustrated here? Dynamic & modifiable: https://t.co/2zHDDNMnvW.

2 16
2019-04-19