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Distance between two points (8,-4) and (...

Distance between two points (8,-4) and (0,a) is 10. All the values are in the same unit of length. Find the possitive value of a.

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The correct Answer is:
2
From distance formula `(8-0)^(2)+(-4-a)^(2)=100 rArr (4+a)^(2)=36 rArr a=2`
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