描述
Elementary theorem, to tech to your kids, mine is seven, and it worked.
with the cubes you can see and teach how area of a square is found, how to find the area of hypotenus and legs. have fun whith your kids
标签
版权声明

Elementary theorem, to tech to your kids, mine is seven, and it worked.
with the cubes you can see and teach how area of a square is found, how to find the area of hypotenus and legs. have fun whith your kids