what is the distance between points (a,b) and (-a,-b) ?
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Distance between two points (x1,y1)and (x2,y2) can be calculated using the formula (x2−x1)2+(y2−y1)2
Therefore, distance between the points (a,b) and (−a,−b) is
=(−a−a)2+(−b−b)2
=4a2+4b2
=2a2+b2
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