There are three types of squares: T-squares, L-squares, and triangular squares
The T, L, and triangular squares are measuring and marking tools used in carpentry, mechanics, construction, and other areas where precise measurement and marking are required.
The T-square is used to measure right angles and to draw lines parallel to the edges of a workpiece. It is composed of two arms perpendicular to each other, one longer than the other, with a scale engraved on both arms to facilitate measurement.
The L-square, also known as the carpenter’s square, is used to measure 90-degree angles and to draw lines parallel to the edges of a workpiece. It is composed of two arms perpendicular to each other.
Triangular squares are used to measure and draw right and non-right angles. They are composed of a metal or plastic triangle with a scale engraved on its sides. There are several types of triangular squares, such as the 30-60 degree square and the 45-degree square, each designed to measure and draw specific angles.
In pattern design, we can use the three types. To take measurements, we will use the millimeter L-square on the exterior and interior.