Hi can someone hep me pls and if you don't know the answer pls don't answer and pls don't send links I forgot to attach the pitch sry

Answer:
Step-by-step explanation:
it doesn't really say what the "face" is, but i'll guess that it's the part marked in yellow? if that's the case then it's just 10 * 10 twice for each of the squares. Really you couldn't see that? :/ 200 is the answer