Young geometers flex their transformation muscles in this brief but powerful exercise using dilations and translations to develop the similarity of circles. The plan provides guidelines to help learners navigate a pair of...

Proving triangles are similar is often an exercise in applying one of the many theorems young geometers memorize, like the AA similarity criteria. But proving that the criteria themselves are valid from basic principles is a great...

Explore transformations of a polygon that include: 1) translation 2) rotation 3) reflection and 4) dilation.

Students use the Cabri Geometry II Plus software to invert, rotate and dilate a figure.