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Kiú-piên-hìn

Kiú-piên-hìn

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Kiú-piên-hìn
Chang Kiú-piên-hìn chhak-kûi chok-thùMien-chitChang Kiú-piên-hìnYit-pân Kiú-piên-hìnChhṳ-yèn chûng ke Kiú-piên-hìn

Kiú-piên-hìn (Yîn-ngî: Nonagon) he kiú-piên ke Tô-piên-hìn, Chang Kiú-piên-hìn he kiú-kok siông-tén. Nui-kok vì 140°. Ngiâ piên-chhòng vì a {\displaystyle a} {\displaystyle a}, mien-chit A = 9 4 a 2 cot ⁡ π 9 ≈ 6.18182 a 2 . {\displaystyle A={\frac {9}{4}}a^{2}\cot {\frac {\pi }{9}}\approx 6.18182a^{2}.} {\displaystyle A={\frac {9}{4}}a^{2}\cot {\frac {\pi }{9}}\approx 6.18182a^{2}.}. Ngiâ-yû chang kiú piên hìn A B C D E F G H I {\displaystyle ABCDEFGHI} {\displaystyle ABCDEFGHI}, A E = A B + A C {\displaystyle AE=AB+AC} {\displaystyle AE=AB+AC}. Kì he ki Chang chhit-piên-hìn heu nang yit-ke put-nèn chhak-kûi chok-thù ke chang Tô-piên-hìn.

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Kiú-piên-hìn.
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Chang Kiú-piên-hìn.
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Chang Kiú-piên-hìn chhak-kûi chok-thù

Mien-chit

Chang Kiú-piên-hìn

Yit-pân Kiú-piên-hìn

Chhṳ-yèn chûng ke Kiú-piên-hìn