Question 1093508
show that the points (-3,1),(3,-1),(1,3) are the vertices of an isosceles triangle.
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Label them A(-3,1), B(3,-1), C(1,3)
Find the 3 lengths.
If 2 are equal, it's isosceles.
o/w, it's not.
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find its area?
IDK  Maybe.  Do you want to?