I have already answered... It's very easy, to resolve this exercise is necessary to use the cartesian coordinate system. However the answear is: right triangle. ;)
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The triangle formed by points D(7, 3), E(8, 1), and F(4, -1) is determined to be a right triangle after calculating the lengths of its sides and verifying using the Pythagorean theorem. The lengths were found to confirm that the sum of the squares of the two shorter sides equals the square of the longest side. Therefore, the correct answer is C. Right triangle.
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