C-11-Q055mediumsingle_mcqশীর্ষ A(x1,y1),B(x2,y2),C(x3,y3)A(x_1, y_1), B(x_2, y_2), C(x_3, y_3)A(x1,y1),B(x2,y2),C(x3,y3) ত্রিভুজের ক্ষেত্রফল—a12∣x1(y2−y3)+x2(y3−y1)+x3(y1−y2)∣\dfrac{1}{2}|x_1(y_2-y_3) + x_2(y_3-y_1) + x_3(y_1-y_2)|21∣x1(y2−y3)+x2(y3−y1)+x3(y1−y2)∣b12(x1+x2+x3)(y1+y2+y3)\dfrac{1}{2}(x_1+x_2+x_3)(y_1+y_2+y_3)21(x1+x2+x3)(y1+y2+y3)cx1y2+x2y3x_1 y_2 + x_2 y_3x1y2+x2y3dx12+y12\sqrt{x_1^2 + y_1^2}x12+y12