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Distance between points (-1,-2) and (a,b...

Distance between points (-1,-2) and (a,b) is

A

6

B

`sqrt((a+1)^(2)+(b+2)^(2))`

C

3

D

`sqrt((a+1)^(2)+(b+2)^(2))-3`

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The correct Answer is:
A
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