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![geometer geometer](https://www.pdffiller.com/preview/241/904/241904760.png)
I was at the TVDSB STEAM conference and saw a session on creating Mandalas to combine geometry and art expectations for Gr7&8 by & I was inspired to make this quick dynamic version. In the mean time drag the points and create your own designs and figure out which portion represents what fraction of the whole. I don't think it's as good as it could be so I am looking for suggestions.
![geometer geometer](https://i.pinimg.com/originals/82/f4/00/82f40081b26efdcaedadb894ffd3d62e.png)
I wasn't originally thinking of that but then made this version that fits those types of images but it's dynamic. So I made a dynamic version where you can change the dimensions of the trapezoid.Īfter I posted the Dynamic Mandala (below) suggested it reminded him of (really go to that site first). In the last couple of months I have seen a couple of videos of this transformation from trapezoid to triangle to prove the formula for the area of a trapezoid ( here and here).
![geometer geometer](http://4.bp.blogspot.com/_qHsSKa-iP_c/StPzEaJdr3I/AAAAAAAAABY/KWr-1hOajvk/s400/Geometer+Sketchpad+1.jpg)
They can then generate an infinite number of new angles to measure. When they check their answer they will be marked correct if they are within one degree. They can measure angles less than 90 o, 180 o or 360 o. In this sketch students can practice measuring angles with a protractor. In this sketch they can move the ladder manually or automatically. This sketch dynamically models a classic calculus problem: a ladder where the bottom slides away from the wall.