Question

find the area of triangle whose vertices are(-5,1),3,-5)and(5,2)​

Answer 1

1/2[ X1(y2-y3)+X2(y3-y1)+X3(y1-y2]

1/2[(-5)(-5-2)+(3)(2+1)+5(-1)(-5)]

1/2[35+9+20]

32 square units