although the pascal triangle is named after blaise pascal, several other mathematicians applied their knowledge 100 years back before the birth of pascal in1625. jia xian presented this mathematical triangle in 11th century. Yang Hui studied the triangle in 13th century. therefore, it is known as the yang hui's triangle in china.
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Euclid developed Euclidean geometry around 300 BC. I cannot get much briefer than that.
Two sides of a triangle do not, automatically, give you the measure of the third side. Further information about the triangle is required.
A downward pointing triangle.
A triangle twice as high as a parallelogram with the same base has the same area.
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