When it comes to Geometry and Spatial Sense: constructing parallel, perpendicular, and intersecting lines; sorting and classifying triangles and quadrilaterals by geometric properties; constructing angle bisectors and perpendicular bisectors; investigating relationships among congruent shapes; relating enlarging and reducing to similar shapes; comparing similar and congruent shapes; performing and describing dilatations; tiling a plane; plotting points in all four quadrants This link is a great way to practice geometry and spatial sense.
http://cemc2.math.uwaterloo.ca/wired_math/
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