Four
3
4
You would have 8 right-angled triangles inside the square.
To create a hexagon using triangles, you can divide the hexagon into 6 equilateral triangles by drawing lines from each vertex to the center of the hexagon. Therefore, it would take 6 triangles to completely fill a hexagon.
Different triangles may have none, one, or three lines of symmetry.
3
24
yes
All triangles - equilateral or not - have three straight sides.
4
4
There is no specific name. Using a single straight line, a rectangle can be halved into triangles, smaller rectangles, or pentagons. There are infinitely many possibilities using more than one lines in the cut.
You would have 8 right-angled triangles inside the square.
There are eleven.
3
never tried it without my Gay lines so I wouldn't know for sure, but try 3 and see what you get
There are 16 possible triangles.