(John of the clue crew reporting)  Because the geometric shape here has all right angles, it's called a rectangle; when they're not right angles, it becomes this type of quadrilateral
The line can then be folded 
up to a 3,4,5 right triangle with ...... is a similarity in which the shape of a figure is 
preserved but its size is .... similar because the intersecting angles are equal, i.e.,.