Question
What is the standard equation when the center is (-1, -1) and the point on the circle is (4, -5)?
Hint:
The radius of circle is the distance between center of circle and any point on the circle. Using distance between two points formula find radius.
The correct answer is:
If there are two points 
and 
,then distance between two points is
Distance between the center (-1, -1) and the point on the circle (4, -5) is equal to radius
Radius (r) 
Equation of a circle whose centre is (h, k) and radius is r is 
Therefore, The standard equation of the circle is
and ,then distance between two points isDistance between the center (-1, -1) and the point on the circle (4, -5) is equal to radius
Radius (r)
Equation of a circle whose centre is (h, k) and radius is r is
Therefore, The standard equation of the circle is
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