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which is wrong and why (x2−x1)2+(y2−y1)2−−−−−−−−−−−−−−−−−−√, (8−4)2+(12−10)2−−−−−−−−−−−−−−−−√ , (4)2+(2)2−−−−−−−−−√, = 16+4−−−−−√ .= 20−−√