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Yes - by the Pythagorean Theorem, if it is a right triangle, the square of the hypotenuse will be equal to the sum of the squares of the other two sides.

36² =1296

77² = 5929

85² = 7225

since

1296 + 5929 = 7225

i.e.

36² + 77² = 85²

a triangle with sides 36, 77, and 85 will be a right triangle with the hypotenuse being the side of length 85 and the right angle being the angle between the sides of length 36 and 77.

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Q: Does a triangle with sides 36 85 77 form a right angle?
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