Five Triangles blog 89: Area of a quadrilateral
Dynamic construction of the quadrilateral area problem from the Five Triangle's blog #89 at [url]http://fivetriangles.blogspot.com/2013/08/89-area-of-quadrilateral.html[/url] .
- 目标群组(年龄)
- 15 – 18
- 语言
- English (United States)
