find the distance between the following pairs point(+a,+b) (-a,-b)
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let A (a, b) =x¹, y¹ and B (-a, -b) =(x², y²) be the points of a straight line
AB=√(x¹-x¹) ² + (y²-y²) ²
AB= √ (-a-a) ² + (-b-b) ²
=√(-2a) ² + (-2b) ²
=√4a²+4b² = 2√a²+b² units
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