Thus, the area of DABC is
Note:
As the area cannot be negative, we have taken absolute value.
Let us try some examples.
So the area of the triangle is 24 square units.
Example-19.
Find the area of a triangle formed by the points A(5, 2), B(4, 7) and C(7, -4).
Solution :
The area of the triangle formed by the vertices A(5, 2), B(4, 7) and C(7, -4) is given by
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