根據圓周角定理,在同一圓中,兩個截取相同弧的圓周角必定相等。
円周角定理により、同じ円の中で、同じ弧に挟まれた二つの円周角は必ず等しくなります。
According to the inscribed angle theorem, in the same circle, two inscribed angles intercepted by the same arc are equal.
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