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is triangle DEF with verticies D(-3,-4), E(2.-5), F(0,1) a right triangle?

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Ah, a slightly different twist :)

For the third time, find the squares of the lengths of the three sides.

If the sum of the squares of the two smaller sides = the square of the third side, it is.
like if
c^2 = a^2 + b^2 it is right

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