Reason, as shown in figure:

① area = ⑤ area;

② Area = ⑥ area;

③ area = ⑦ area;

(4) area = 8 area;

Pet-name ruby area = 3x2 = 6

⑤+⑥+⑦+⑧=( 100-6)÷2=47

Shadow area = 47+6 = 53