To calculate the area of a composite shape you must divide the shape into rectangles, triangles or other shapes you can find the area of and then add the areas back together. You may have to ...

To expand students mathematical understanding of non-prototypical triangles as children frequently develop very restricted conceptions of geometric shapes. They often identify them solely based on ...

While initially very similar looking, these triangles behave very differently under dragging. "What kinds of shapes do you see on the screen?" "Are there any differences?" (typical responses: colour, ...