Îⁿ-chiu-kak

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kí-hô-ha̍k tiong, îⁿ ê 2 tiâu koah-soàⁿ tī îⁿ-chiu téng sio-tú, chiū ē hêng-sêng chi̍t ê îⁿ-chiu-kak (圓周角).