Long description: Trig6Fig2
Alt text: A right-angled triangle labeled ABC is shown with trigonometric ratios for sine and cosine.
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- A right-angled triangle is drawn with vertices labeled A, B, and C.
- The angle at vertex C is marked with a square symbol, indicating a right angle (ninety degrees).
- The sides opposite vertices A, B, and C are labeled \(a\), \(b\), and \(c\) respectively, with the side \(AB\) being the hypotenuse.
- The sine of angle A is shown with the expression \(\text{sin } A = \frac{B C}{A B}\).
- The cosine of angle A is shown with the expression \(\text{cos } A = \frac{A C}{A B}\).