We know that the general equation for a circle is ( x - h )^2 + ( y - k )^2 = r^2, where ( h, k ) is the center and r is the radius. So add 21 to both sides to

Best free math solving app, everytime i have an assignment and i didn't know what to answer he is here to explain every single answers, gladly you made an edit section where I can write the problem instead of making a photo, has lots of categories to find answers and learn steps.

Anthony Burse

5/5 no problems and not too many ads, amazing really helpful especially for notes. And also, is it possible for it to have a feature where you can just easily import and crop an image instead of having to take photo evertime? It would be really convenient to have it.

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Amazing app it gave you all the good answers and if you didn't understand how they explained to you so it's basically amazing and probably better than most teacher's, beautiful app, at first I just used it to get questions right on frustrating math homework but then I figured out that I could use it to see how to do the questions which is now helping me in college.

Michael Belew

To find the center & radius of a circle, put the circle equation in standard form. We can also use three points on a circle (or two points if they are at

Learn how to find the center and radius of a circle, either from an equation or a visual.

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