Question

Please help me with a problem of Derive the Formula for Area of a Triangle

Answer 1

You can use
$\frac{1}{2} ab \sin(c)$
Since it is an irregular triangle.
C refers to the angle and a & b refer to the adjacent sides.

So,
$\frac{1}{2} \times4.3 \times 3.8 \sin(53) \\ = 6.52485211 \\ = 6.52$