Don't forget that equation of a circle is x^{ 2 }+y^{ 2 }=a,( a=r^2) and the coordinate system produce Right triangles with an angle theata , the angle of interest, \theta \quad \epsilon \quad R and theta is between 0, pi/2.

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TopNewestwhat about writing: a^[2] insted of a ? – Eduardo Viruena · 2 years, 6 months ago

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– Hugh Chen · 2 years, 3 months ago

x^2 + y^2 = r^2, r is radius, will be even better. This is exactly the Pythagorean theorem.Log in to reply