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how can we find the radius of a circle if we know three points that lie on it. let those points be (a,b), (c,d), (e,f). Please teach me how to do these types of questions. Thank you

 
how can we find the radius of a circle if we know three points that lie on it. let those points be (a,b), (c,d), (e,f). Please teach me how to do these types of questions.
Thank you

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2 Answers

Saurabh Kumar
askIITians Faculty 2400 Points
8 years ago
Write the basic euation of circle.
As the circle is pasing through the given points, so put these coordinates value i place of variable terms, x and y.
or use this equations and find the solution.
a(x – x1) + b(y – y1) = 0
Put the value of x and y and calculate the answer...
albert
9 Points
8 years ago
but sir with your equations there will be four unknowns and three equations only as i will not know x,y,a,b.

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