Description for Correct answer:
Let the length of rectangle be l m and breadth be b m

According to question,

l - b = 5 --- (i)

Perimeter of rectangle = \( 2 \left(l+b\right)=86 \)

l + b = 43 --- (ii)

On soling equations (i) and (ii) we get,

l = 24 m

b = 19 m

Height of triangle = Length of rectancle = 24 m

and base of triangle = Breadth of reftangle = 19m

Area of triangle= \( \frac{1}{2} \times 19 \times 24 = 228 m^{2} \)