I received accurate measurements though doing my assignments using this type of T-sq., as it can be graduate with 16ths on each side, so I could quickly get measurements from all angles and sides. A T-square, also called a folding sq., is a bit of equipment used in complex graphics. https://marcoskykx.aioblogs.com/81640758/getting-my-t-shaped-handle-90-degree-compression-to-work