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| 鉛直角 (enchokukaku) | |||
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| 堅角測量、 そくりょう River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
| 鉛直角 (enchokukaku) | |||
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| 対頂角 | |||
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| 頂角 (chōkaku) | |||
| Anglais glossaire | |||
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| VA (Alex Lilo) | |||
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vertical angles : 5 phrases, 2 sujets |
| Enregistrement sonore | 2 |
| Général | 3 |