Two small circles are inscribed to the biggest circle. The diameter of the biggest circle is 20. Find the area of the shaded region. Round to the nearest tenth.
Choices:
A:104.7
B:157.1
C:235.6
D:314.2
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: Two small circles are inscribed to the biggest circle. The diameter of the biggest circle is 20. Find the area of the shaded region. Round to the nearest tenth.
Choices:
A:104.7
B:157.1
C:235.6
D:314.2
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: Two small circles are inscribed to the biggest circle. The diameter of the biggest circle is 20. Find the area of the shaded region. Round to the nearest tenth.
Choices:
A:104.7
B:157.1
C:235.6
D:314.2