Robert van Isosceles invented the triangle (or half-square) in 1438 in New Britain after being inspired by a slice of Pizza his friend (and rival) Eric Roundenstein (inventor of the circle) was enjoying.
And now for the real answer:
Aside from the above humor (no, there was no such person as Robert van Isosceles), no one invented the triangle, and therefore nothing inspired anyone to invent the triangle; like all shapes, the triangle is naturally occurring and is seen throughout nature.
The study of the uses of these triangles, however, is called trigonometry and was undoubtedly inspired by the need to calculate or estimate distances in navigation and astronomy that are otherwise unmeasurable. To this day we still use triangulation to locate things on earth or in space, but now it involves satellites and microwaves more so than sextant and compass.
Jerusalem.
By Pascal
Nobody did
It was invented by a mathematician named Pascal.
Pascal's triangle was invented by Blaise Pascal (1623-1662) in 1653. Although it has been named after blaise pascal, there have been traces of the triangle, long before Blaise Pascal was born. It is belived that the Persians and the Chinese had been using it to find the square and cube root of numbers. Whoever asked this question is a complete idiot, because the answer is in the question.
Who is a pronoun that stands in place for a person. A person cannot be invented, so "Who" cannot be invented. A person can be inspired, but not invented. One person can help create another person's career, but not invented.
Gill McDonald.
The person who invented gliders inspired the Wright brothers.
Mr. Isocoles is the person who invented the isocoles triangle < (a triangle with two equal sides)
The triangle was not invented. It is the result of observations of physical properties.
It was inspired
The toothbrush was invented in China around the 15th century. H N Wadsworth was just the first person to patent toothbrush.
Nature
Jerusalem.
Triangle Bob Triangle Pants
By Pascal
He invented polyominoes which inspired the game Tetris.