# Thread: Equation of a quadrant (of a circle)

1. ## Equation of a quadrant (of a circle)

As the picture implies
I am currently taking a calculus course at a university, and of course we are starting off with some review after forgetting everything over the summer
The section that this question is under is titled "Inverses, logarithms, and exponential functions" but honestly I have no idea what to do
No one even has to solve this, just getting me on the right mental track would be appreciated

2. Originally Posted by Breadordecide

As the picture implies
I am currently taking a calculus course at a university, and of course we are starting off with some review after forgetting everything over the summer
The section that this question is under is titled "Inverses, logarithms, and exponential functions" but honestly I have no idea what to do
No one even has to solve this, just getting me on the right mental track would be appreciated
In the first instance you would be well-advised to review the material you have forgotten. For example: Do you know what one-to-one means? Do you know what a domain is? Do you know what inverse functions are and how to find them?

3. To the above,
yes I know what one-to-one means (in regard to the horizontal line test)
I can do the domain part, and the inverse part, but I don't remember (or am I even sure that I learned) how to find the equation they're asking for [I know that for a circle it's x^2 + y^2 = R^2]

4. Since functions are typically written "y= f(x)", I suggest you solve $\displaystyle x^2+ y^2= R^2$ for y. Thinking about the signs of x and y in the four parts of the graph will give you the four functions.

### equation of a quadran

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