Explanation
Distance AB = √(2a−2a)2+(6a−4a)2=√4a2=2a
Distance AC = √(2a+√3a−2a)2+(5a−4a)2
√3a2+a2=2a
Distance BC= √(2a+√3a−2a)2+(5a−6a)2
AB = BC = CA
Equilateral Triangle
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