plz find the 3rd one
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(a,b) and (-a,-b)
formula for distance between two points
= √{(x1 - x2)² + (y1-y2)²}
here x1 = a
x2 = -a
y1 = b
y2 = -b
so distance = √{(a+a)²+ (b+b)²}
= √{4a²+4b²}
= 2√{a²+b²}
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