Trigonometry

Trigonometry (from Greek trigonon "triangle" + metron "measure")
Want to learn Trigonometry? Here is a quick summary.
Follow the links for more, or go to Trigonometry Index
triangleTrigonometry ... is all about triangles.
Trigonometry helps us find angles and distances, and is used a lot in science, engineering, video games, and more!

Right-Angled Triangle

The triangle of most interest is the right-angled triangle. The right angle is shown by the little box in the corner:
triangle showing Opposite, Adjacent and Hypotenuse
Another angle is often labeled θ, and the three sides are then called:
  • Adjacent: adjacent (next to) the angle θ
  • Opposite: opposite the angle θ
  • and the longest side is the Hypotenuse

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