A minimum of 2 triangles are needed, but you can also make a rectangle with 3 or more triangles.
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The question makes no sense because "rectangular" is an adjective. So is the question seeking the number of triangles in a rectangular pyramid, a rectangular dipyramid or some other shape?
4 triangles make 1 hexagon. (easy way to find out how many triangles there are in a polygon- take number of sides of the polygon, subtract 2 from it, that's your answer!)
Yes, they can. To demonstrate this draw a square on a sheet of paper. Draw a line diagonally from one corner to the one opposite. Cut along this line and you will have two triangles. Take them apart; if you put them together again in the right way you will have a square. Put together in different ways you can make an isosceles triangle or an equilateral parallelogram. If you do the same thing beginning with a rectangle, you will be able to reassemble the triangles to form a rectangle, isosceles triangle or a (non-equilateral) parallelogram.
a rectangle doesn't have four equal sided measurements, which is the definition of a square. also it can take one or more squares to make a rectangle but u can't make a rectangle into a square.
it would have 18 triangles because u take 2 away each time.
yes,take 2 big triangles.then,take 2 small triangles and a square. first on the right put a triangle facing like a hill.on the left do it the opposite way then put the square in the middle of the 2 triangles and take the 2 small triangles and put them in the middle 2