Question

if area of a triangle is 35sq,units with vertices (2,-6),(5,4) and (k,4).then k is

Answer 1

35square=1/2{ x1(y2 -y3) + x2(y3-y1) +x3(y1-y2)

35×2=2(4-4) +5(4-2) +k(-6-4)

70= +10 -10k

60 = -10k

k= -6 or k=8

because negative area also taken pisivive