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Mathematics 13 Online
OpenStudy (anonymous):

a triangle has sides of lengeths 4, 3 and 5 is it a right triangle?

OpenStudy (wolf1728):

Yes it's a right triangle. Among other things the numbers 3, 4 and 5 are what is known as a "Pythagorean Triple". (3 integers in which the sum of the squares of 2 of them = the square of the third.)

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