May someone help me I kinda stuck and I would love some help it 6th-grade math!

Answer:
72
Step-by-step explanation:
first, you cut the top of the T and you multiply 12 x 3 which is 36. Then with the 4 cm on both sides, I'm assuming the middle part is also 4 (since the other side is 12) and then you multiply 9 x 4 which is also 36, then you add and get 72!