Trigonometry Basics
This page introduces the fundamental trigonometric ratios of sine, cosine, and tangent in right-angled triangles. It explains how to use these ratios to solve for unknown sides and angles.
Definition: In a right-angled triangle, the sine of an angle is the ratio of the opposite side to the hypotenuse, the cosine is the ratio of the adjacent side to the hypotenuse, and the tangent is the ratio of the opposite side to the adjacent side.
The page provides formulas for each ratio:
sin α = Opposite / Hypotenuse
cos α = Adjacent / Hypotenuse
tan α = Opposite / Adjacent
Example: In a right-angled triangle with hypotenuse 7cm and an angle of 20°, the opposite side can be calculated using sin 20° × 7 = 2.39 cm.
The page also includes a diagram illustrating these relationships in a right-angled triangle, which is crucial for visual learners to understand the concepts of sinus, cosinus, tangens einfach erklärt.
Highlight: The page emphasizes the importance of identifying the correct sides opposite,adjacent,hypotenuse in relation to the angle being considered when using these trigonometric ratios.