4x4xpiex1/4=4pie (round off to 2 s.f.)
8x8xpiex1/4=16pie (round off to 2 s.f.)
Take the sum of the following above and take 64 (8×8) minus 16 pie
Then you take the sum minus the the 4 pie.
Done lah, got method marks, no need answer can liao. 😉
but srsly, thats almost impossible just that area. unless you guess and check or something :/