The correct answer is:

24 sq. units

24 sq. units

**Explanation:**

The area of the triangle formed by the vertices $A(1,âˆ’1),B(âˆ’4,6)$ and $C(âˆ’3,âˆ’5)$, by using the formula above, is given by

$$\displaystyle \dfrac{1}{2}$ â€‹[1(6+5)+(âˆ’4)(âˆ’5+1)+(âˆ’3)(âˆ’1âˆ’6)]$

$=$\displaystyle \dfrac{1}{2}$(11+16+21)=24$So, the area of the triangle is 24 square units.