A Carpenter.
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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.
answer:-to draw vetical and inclined lines
Instrument Ruller, Rubber, set square, T Square, Drawing Table, Compass, etc.
The ancient Egyptians for one. They made quite a few of them.
a triangular cylinder