Home›Browse›Niven's theorem🌐EnglishEnglishDeutschEspañolFrançaisPortuguêsTürkçeالعربيةفارسی中文日本語EntityQ4116459· pop 14· linked from 10 articlesNiven's theoremSign in to saveThe only rational angles in first quadrant whose sine is rational are 0, 30 and 90 degreesAvailable in 14 languagesEspañolFrançaisDeutsch中文日本語PortuguêsالعربيةAfrikaansBanglaCentral KurdishHebrewTürkçeفارسیvia Wikidata sitelinks · CC0