In this triangle \(a^2 = b^2 + c^2\) and angle \(A\) is a right angle. Pythagoras' theorem only works for right-angled triangles, so you can use it to test whether a triangle has a right angle or not.

An understanding of how to use Pythagoras’ theorem to find missing sides in a right-angled triangle is essential for applying the theorem in different contexts. (3,1) is the coordinate that is 3 along ...

Two high school students have proved the Pythagorean theorem in a way that one early 20th-century mathematician thought was impossible: using trigonometry. Calcea Johnson and Ne’Kiya Jackson, both at ...

ROBERT P. CREASE is a professor in the philosophy department at Stony Brook University, a historian at the Brookhaven National Laboratory and a columnist for Physics World. This is adapted from an ...

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Pythagoras was a smart guy: sure, he had some pretty rogue beliefs about beans, but the man knew his triangles, something ...

Bill Whitaker is an award-winning journalist and 60 Minutes correspondent who has covered major news stories, domestically and across the globe, for more than four decades with CBS News. A high school ...

Two New Orleans high school students recently attended a conference where they proved an “impossible” math problem by using trigonometry. For more than 2,000 years, mathematicians worldwide have ...