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求角
我们如何用反三角函数求出直角三角形中未知的角？
1. Introduction
Introduction
2. Evaluating inverse trigonometric functions
Evaluating inverse trigonometric functions
3. Finding angles in applied contexts
Finding angles in applied contexts
4. Summary
Summary
5. Hypotenuse from two legs
A right triangle has legs 11 and 13. What is its hypotenuse, to two decimal places?
6. Angle from an opposite leg
A right triangle has an opposite leg 1 and hypotenuse 3. What is the angle opposite that leg, to three decimal places?
7. Angle from cosine in the third quadrant
An angle in standard position has cos(alpha) = -1/2 and lies in Quadrant III. What is alpha?
8. Angle of elevation to a balloon
A balloon is 200 feet high and observed from 850 feet away. What is the angle of elevation?
9. Inverse trigonometric functions return angles
An inverse trigonometric function takes a ratio and returns an angle.