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Crafty Cut
$free with IAP ($8)
Ages: 8-up
Teaches: math, geometry in Spanish or English
CTR Review
Future diamond cutters (and current math teachers), take note of this app.

It lets you use your favorite finger to slice common 3D geometric forms into new forms, to try to make a target shape. You can see how a rectangle is inside of a cylinder when sliced in half, ...
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