The answer depends on their relative sizes and configuration.
Two right angle triangles, normally scalene triangles. However, if the rectangle is for example a square, then it would be two isosceles triangles.
A rhombus
if you draw a line from one corner of a rectangle to the opposite it creates two triangles
Rectangular pyramid
1 method is to multiply length times the width and the 2 method is to divide the rectangle into triangles and find the area of one of the triangles and multiply the area by two.
Two of them
Two right-angled triangles placed hypotenuse to hypotenuse with one inverted form a rectangle...
A rectangle has two pairs of congruent (meaning identical) sides.If, however, you drew two lines diagonally from corner to corner, you would have two pairs of congruent triangles within the rectangle.
If the 2 triangles are right triangles, which are congruent to slicing the rectangle on the diagonal, then arrange one on top of the rectangle, and the other to the side, so that the two hypotenuses are in line with each other. This will make a bigger right triangle, which is similar to the smaller right triangles - each side is double of the smaller triangles.
yes
Divide the rectangle in two triangles and then use the pythagorean theorem to find the remaining sides.
Two triangles.