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 ...

Mathematicians’ Favorite Shapes Hold the Key to Big Mathematical Mysteries ...

It's possible to demonstrate and prove mathematically that the angle sum of every triangle is 180 degrees. The techniques used are useful for solving all kinds of other geometry problems too.

Mark the 90° right angles in the bottom left and top right corners. You can split a rectangle into 2 right-angled triangles. Image caption, STEP 2: Use the compass to draw a circle. Put a dot ...

Mathematicians have finally solved a geometry problem that has puzzled ... in a way that forms a triangle with curved edges instead. “It’s just a problem about how straight lines can intersect ...

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, ...