C-11-Q018mediumsingle_mcqP(x1,y1)P(x_1, y_1)P(x1,y1) ও Q(x2,y2)Q(x_2, y_2)Q(x2,y2)-এর মধ্যে দূরত্ব—a(x2−x1)+(y2−y1)\sqrt{(x_2-x_1) + (y_2-y_1)}(x2−x1)+(y2−y1)b(x2−x1)2+(y2−y1)2\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}(x2−x1)2+(y2−y1)2c(x2−x1)2+(y2−y1)2(x_2-x_1)^2 + (y_2-y_1)^2(x2−x1)2+(y2−y1)2d∣x2−x1∣+∣y2−y1∣|x_2-x_1| + |y_2-y_1|∣x2−x1∣+∣y2−y1∣