" 6.centre at the origin and radius "4

Two points P and Q in the Argand diagram represent z and 2z+3+i. If P moves on a circle with centre at the origin and radius 4, then the locus of Q is a circle with centre

Consider a circles S with centre at the origin and radius 4. Four circles A, B, C and D each with radius unity and centres (-3, 0), (-1,0), (1,0) and (3, 0) respectively are drawn. A chord PQ of the circle S and passes through the centre of the circle C. If the length of this chord can be expressed as sqrtx , find x.

Consider a circles S with centre at the origin and radius 4. Four circles A, B, C and Deach with radiusunity and centres (-3, 0), (-1,0), (1,0) and (3, 0) respectively are drawn. A chord PQ of the circle Sne circle B and passes through the centre of the circle C. If the length of this chord can beexpressed as sqrtx , find x.

If the point (x ,4) lies on a circle whose centre is at the origin and radius is 5, then x= +-5 (b) +-3 (c) 0 (d) 14

If the point (x,4) lies on a circle whose centre is at the origin and radius is 5, then x=+-5 (b) +-3(c)0(d)14

In the figure, O is the centre of the circle and x^2+y^2=25 is the equation of the circle. Write the equation of the circle whose centre is at the origin and radius is 3. .

C_1 is a circle with centre at the origin and radius equal to 'r' and C_2 is a circle with centre at (3r, 0) and radius equal to 2r. The number of common tangents that can be drawn to the two circle are :

Show that the differential equation of the family of circles having their centres at the origin and radius 'a' is : x+y (dy)/(dx)=0 .

Find the equation of the circle with centre at the origin and radius '5 .' Write the coordinates of eight points on this circle.