Small Basic Featured Article – How to Use Trigonometric Functions

Here’s a classic article from Nonki: Small Basic: How to Use Trigonometric Functions    Let’s imagine we want to draw an arc.   Assume the center of the arc is located at x = 200, y = 300, and the start angle is a1 = -30 and the end angle = -60.In mathematics, the y axis goes up.  But in…

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