QUESTION: What is the radius of a circle whose center is at C(-1, 3) passing through point P (7,11)?
SOLUTION:
Here center C = (a, b) = (-1 , 3)
So,
a = -1
b = 3
Point P passing through the circle = (c, d) = (7, 11)
So,
c = 7
d = 11
Distance between point C and P is the radius of the circle.
As we know, formula of finding distance between point (a, b) and point (c, d) =
Thus, the radius r of a circle = CP
=
=
=
=
= 11.314
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