Mathematics
Grade9
Easy
Question
In the equation 
, the radius of the circle is _____________.
- 8
- 9
- 4
- 1
Hint:
The standard equation of a circle with center (h, k) and radius r is: 
Compare the given equation with standard equation of a circle and find r.
The correct answer is: 8
The standard equation of a circle with center (h, k) and radius r is:
In circle ,
Upon comparing with standard equation of a circle then we get
Therefore, the radius of circle is 8.
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