It's primarily a template for drawing lines at accurate right-angles and other angles to a line, usually 30º / 60º and 45º for standard set-squares.
It's also used for drawing parallel lines.
Adjustable set-squares allow you to set off other angles.
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In a calculator it makes the screen the same number across left to right as up and down even if the screen is not square.
The area of a square is a function of the perimeter of the square.
A set square is known as a set square and not triangle because when you divide 180 by 4, then you get 45. Now, if you construct a square with side: 45 degrees and then divide it in half, then you get the measurement 45-45-90.
A set square is used in geometry to draw parallel lines. It is also used to make sure that angles are drawn correctly. There are grooves in the set square where a pencil can be inserted to draw a line. There is also a hinge that allows for moving the two pieces of the set square to the proper angle before drawing.
A set-square.