(Have several students explore this - they need to be convinced that the blue triangle can't overlap the pink triangle). Have the students draw a design on paper using only triangles. Ask them 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 ... Have the ...

A pretty theorem in the latter is that all equilateral triangles in a given plane project ... which is not very easy to contrive when a student is drawing figures for himself.

You can split a rectangle into 2 right-angled triangles. Image caption, STEP 2: Use the compass to draw a circle. Put a dot where the compass rested and use the ruler to draw a horizontal line ...

Use these to construct a triangle when you know the length of 1 side and the 2 angles at each end of it. In this case use the length 8 cm, and the two angles 40° and 50°. Use a ruler to draw a ...