Distance between two points (x1,y1) and (x2,y2) is (x1−x2)2+(y1−y2)2(i) Distance between(2,3) and (4,1) is =(2−4)2+(3−1)2=(−2)2+(2)2=4+4=8=22(ii) Distance between (−5,7) and (−1,3) is =(−5−(−1))2+(7−3)2=(−4)2+(4)2=16+16=32=42(iii )Distance between (a,b) and(−a,−b) is =(a−(−a))2+(b−(−b))2=(2a)2+(2b)2=4a2+4b2=2a2+b2