Question

Find the area of the triangles whose vertices are (-5,-1),(3,-5),(5,2)

Answer 1

Answer:

1/2| x1( y2 - y3) + x2( y3- y1) + x3( y1- y2)|

1/2 | -5( -8) + 3( 3) + 5(4)|

1/2|-40+9+20|

1/2|-11|

11/2

5.5 sq per unit is the answer