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A speed square or rafter angle square is a tool that can be used as a saw guide. The purpose of this tool is to guide the saw when making short 45 and 90 degree angles.
The idea is to get rid of the square root in the denominator. For this purpose, you must multiply numerator and denominator by the square root of 6 in this case.
If its general purpose mild steel square bar then its 2.01 kg/m. So 12.06kgs all together.
Used for drawing horizontal lines. To support set squares when drawing vertical line and inclined lines.
The purpose is so that on any right triangle, you can figure out how long the length of one of the sides are by multiplying each other side by themselves, adding them together, and then finding the square root of that number.