According to the picture, there are three identical circles that are tangent. Triangle ABC is an equilateral triangle, and A, B and C are all centers of circles. The radii of circles A, B, and C are all 10. What is the length of the arcs in black?
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数学PS
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According to the picture, there are three identical circles that are tangent. Triangle ABC is an equilateral triangle, and A, B and C are all centers of circles. The radii of circles A, B, and C are all 10. What is the length of the arcs in black?
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正确答案: E