(Q4)Let A(x1 , y1) , B(x2 , y2) , C(x3 , y3) be three points. Then find the area of the following triangle and discuss with your friends in groups about the area of that triangle.

XX'YY'ABC(-x1,y2)(x2,y2)(x2-y3)(y2-y3)(x1-x2)

AB = x1 - x2

BC = y2 - y3

A(x1 , y1) = (-x1 , y1)

B(x2 , y2) = (x2 , y2)

C(x3 , y3) = (x3 , -y3)

Area of the △ABC

△ =
1
2
 |bh| =
1
2
 ×AB×BC
  =
1
2
 (x1 - 2)×(y2 - 3)
  =
1
2
 |x1(y2 - 3) - 2(y2 - 3)| sq.u.