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Step-by-step explanation:
AB=OB-OA
AB=[4,-2]-[-4,6]
AB=[8,-8],|AB|=8units
BC=OC-OB
BC=[-6,-4]-[4,-2]
BC=[-10,-2],|BC|=√104
AC=OC-OA
AC=[-6,-4]-[-4,6]
AC=[-2,-10],|AC|=√104
d. Based on the lengths of the sides,the triangle is isosceles