The area of the triangle whose vertices are $(3,5),(1,1),(-4,1)$ is

Question

Professor PC Thomas Classes · Answer

Area $= \frac{1}{2}|x_1(y_2-y_3) + x_2(y_3-y_1) + x_3(y_1-y_2)| = \frac{1}{2}|3(0) + 1(-4) - 4(4)| = \frac{1}{2}|-20| = 10$.