1.

Find the centre and radius radius of the following circles : (i) `(x-1)^(2)+(y+2)^(2)=16` (ii) `(x+2)^(2)+y^(2)=25` (iii) `(x+p)^(2)+(y+q)^(2)=p^(2)+q^(2)` (iv) `x^(2)+y^(2)=7`

Answer» Correct Answer - (i) C(1,-2), r=4 , (ii) C(-2,0), r=5
(iii) `C(-p,-q),r=sqrt(p^(2)+q^(2))`
(iv) `C(0,0)r=sqrt(7)`


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