Right triangle

A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

SINCOSTAN

Trigonometry that clicks — calculators, identities, and worked explanations for angles and waves.

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Every entry, image, and fact is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses. No content is AI-generated.