The triangle was not invented. It is the result of observations of physical properties.
Nature
Jerusalem.
By Pascal
bum
Pythagoras
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
Because Pakistan invented the triangle
58
I'm guessing after the triangle was made.
Nobody did