Philipp Deidesheimer invented the set square in 1860 in America.
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The set square was invented in America in 1860.
A square is a shape and a shape cannot be invented.
Probably the ancient Egyptians who discovered that the diagonal of a unit square was not a rational number. And then discovered other such numbers.
30 60 set squares 45 set square
It wasn't invented, it just was!