For Grades 5 and up
This is a free reference site for learners and educators. At this moment, it consists of only geometry term definitions along with illustrations and interactive animations that provide a visual for better understanding. This site is a great resource for blended learning or e-learning classrooms.
A Junior Resource (grades 4 to 6)
It is worthwhile using this resource to make connections between linear, two-dimensional, and three-dimensional shapes. It provides printable activities and "important words", and well as nets. This can be effectively used for introducing volume in measurement strand.