C-11-Q041mediumsingle_mcqHeron's formula for the area of a triangle is —as(s−a)(s−b)(s−c)\sqrt{s(s-a)(s-b)(s-c)}s(s−a)(s−b)(s−c)b12×base×height\frac{1}{2}\times\text{base}\times\text{height}21×base×heightc12∣x1(y2−y3)+x2(y3−y1)+x3(y1−y2)∣\frac{1}{2}|x_1(y_2-y_3)+x_2(y_3-y_1)+x_3(y_1-y_2)|21∣xdabc\sqrt{abc}abc