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单位圆（续）
角的弧度度量是什么？
1. Summary
Summary
2. Points on the unit circle from constraints
A point (x, y) on the unit circle has x = -0.3 and y negative. What is y?
3. Transforming the unit circle
A circle centered at (h, k) with radius r is the unit circle under which transformations, and what is its equation?
4. Points on a radius-five circle
On a circle of radius 5, what are the coordinates at the central angle pi/6?
5. Negative square root on the unit circle
On the unit circle, x = -0.3 and y is negative. To three decimal places, what is y?
6. Every unit-circle point has coordinates bounded by one
A point on the unit circle must have both coordinates between -1 and 1.