What is the area of this figure? And how do I solve it

Answer:
486
Step-by-step explanation:
you can find out the unknown side by pythagoras theorem
Answer: 297 cm² Option B
Step-by-step explanation: Total Area of the figure = Area of the rectangle + Area of the trapezium
∴ AREA OF THE RECTANGLE = l×b
= 9×15 = 135cm²
∴AREA OF TRAPEZIUM = h/2 (a+b)
12/2 (9+18)
6×27 = 162cm²
∴AREA OF THE FIGURE = 135cm²+162cm²
= 297cm²