Eight lessons that move trigonometry off the right triangle and onto the circle. Once an angle can be any size, the ratios become functions with graphs, a single ratio stops naming a single angle, and questions gain a second answer you have to go looking for.
This is a Path focus area, sitting outside the Core and preparing you for Mathematics Advanced in Year 11. The unit circle is the definition of sine and cosine used for the rest of senior mathematics, and the habit built here, of asking whether a ratio names more than one angle, is what keeps later solutions complete.
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