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Find the distance between the following pairs of points: 
 
1. \((2, 3), (4, 1)\)   
 
Distance between \((2, 3)\) and \(4, 1)=\) ii
 
2. \((−5, 7), (−1, 3)\)   
 
Distance between \((−5, 7)\) and \((−1, 3)=\) ii  
 
3. \((a, b), (− a, − b)\) 
 
Distance between \((a,b)\) and \((− a, − b)=\) iii+ii