The triangle was not invented. It is the result of observations of physical properties.
Jerusalem.
Nature
By Pascal
Pythagoras
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Cindy pham
Mr. Isocoles is the person who invented the isocoles triangle < (a triangle with two equal sides)
the xylophone was invented by Gusikov in 1830
58
I'm guessing after the triangle was made.
Nobody did
It was invented by a mathematician named Pascal.