To read an astrolabe, level the plum bob, the degree scale, the altitude, and the protractor.
I used an astrolabe because i felt like it.
This is a protractor. It helps you measure angles.
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Protractor
i like big butts and i can not lie
An angle ruler is a tool used to measuring angles like a protractor. An angle ruler is more accurate than a protractor.
Eh... Something, I don't really know.
That would be an Astrolabe.
A set-square.
who invented the protractor?
compass, and the astrolabe