Calculating side lengths and radian angle measures in special right triangles in circles

Finding side lengths and radian angle measures in special right triangles in circles
Side lengths and radian angle measures in special right triangles in circles

In these questions we are given a circle which center is located at the axis intersection point (0,0)
We can draw a right triangle from any point on the circle so that the hypotenuse is equal to the radius of the circle and the sides of the triangle are equal to x and y coordinates of the point.
We can check the ratios between the sides of the triangle to see if the triangles are special right triangles. If the triangles are special right triangles, we know the values of their angles.

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