(Q7) Find the area of a triangle formed by the points A(5, 2), B(4, 7) and C(7, -4).

Answer:

The area of the triangle formed by the vertices A(5, 2), B(4, 7) and C(7, -4) is given by

 =
1
2
|5(+)+4(--)+7(-)|
 =
1
2
|-| =|
-
2
| = |-| =

Therefore, the area of the triangle = square units.