EASY AS PI

The holiday season is also filled with pi(e)s. If you've eaten enough pi in your lifetime, you'll have no trouble finding the missing filling here.

 

 

Go to ABCDEF.html as well as Book C, page (B × E + F) × (A + D)

(Book 1 = BS, 2 = MS, 3 = SM, 4 = TP)

ETA: What you need in the book is now just linked on the next page, but if you've solved the puzzle before you should still go there as you won't need to solve it again.