In a circle that has a radius of one you use Pythagorean theorem to derive the sine, cosine and tangent formulas.
Draw a circle around the origin on graph paper. The sine is the line segment from the point where the side of the angle intersects down to the x-axis. etc.
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Pythagoras theorem
The Pythagoras Theorem is-a mathematical equation that measures the area belonging to-a triangle.
he discovered it in 196C
Yes, it's called Pythagoras theorem
X2 + Y2 = The Hypoteneus2