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Which of the following can be used to describe the triangle with the vertices listed below?

F(-1, 1), G(-8, 1), H(-9, -10)

I. acute
II. obtuse
III. right
IV. scalene
V. isosceles
VI. equilateral

-----Please show me how you got the answer

  • Geometry -

    Just make a rough sketch

    obviously GF is a horizontal line (same y values)
    and H is to the left of the vertical through G.
    So angle G is obtuse and we have an obtuse - angled triangle.
    Since there appears to be only one choice in the answers, I did not bother to check if GF = GH to make it also isosceles. That would be easy to check.

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