How many square feet of outdoor carpet will we need for this whole?

Seems like you already have the areas of the separate portions, so just add them up.
12 feet squared+24 feet squared=
36 feet squared.
Answer:
36
Step-by-step explanation:
Unless I'm misreading something, you just add the 2 areas together.
Area_total = 24 + 12
Area_total = 36 square feet.