Question

Do you guys know the domain of a cicrcle in pre-calculas

Answer 1

The domain of a circle depends on the radius.
The general form for the equation of a circle is x^2 + y^2 = 1
This is just an extension of the Pythagorean Theorem and Pythagorean Identity of sin^2 + cos^2 = 1
Remember that sin is the y-axis in pre-calc and that cos is x axis.

With this in mind, the domain would be the same as the radius so if you have a unit circle, it would be [-1,1].

A circle of radius 5, [-5,5].

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