If you draw a single square, and then put one X through it, you have 4 triangles. Put another X through it and you have 8. Now, if you want to make four triangles, simply remove the two diagonal lines in the center, and it will create four triangles. Now, since they're separated by the other triangles, it would mean removing four lines, but that is still your answer.
If you have 8 small triangles made of 16 lines how can you make four small triangles if it is a parallelogram?
Still a pyramid!
27, but you will have to prove it.
Rohmbus is a four sided figure (quadrilateral) that is made up of two equilateral triangles
Two-dimensional shapes made with perpendicular lines include (but are not limited to) right-triangles, rectangles, octagons, and dodecagons. Three-dimensional shapes made with perpendicular lines include (but are not limited to) cubes, octahedrons, cuboctahedrons, and icosahedrons.
yes
They are made of straight lines, all in one plane, such that pairs of them meet at vertices.
a tetrahedron is made of four triangles and has 4 vertices.
square
A regular tetrahedron
A circle, for sure.
A square based pyramid.