That’s the problem. Where are the steps?
Required area of shaded portion
= Area of square ABCD - 4 × area of one quadrant

Answer:
a = -8
Step-by-step explanation:
19 = -3a - 5
Add 5 to both sides.
24 = -3a
Divide both sides by -3.
-8 = a
Switch sides.
a = -8
I believe it is D. Hope this helps!
I believe the answer is segment FD