centre at the origin and radius 4

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

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 .

The line y = sqrt3 x +4 touches a circle with centre at the origin. Find the radius of the circle.

If the point (x,4) lies on a circle whose centre is at the origin and the radius is 5, then x = . . . . . .

If the length of the normal for each point on a curve is equal to the radius vector, then the curve (a) is a circle passing through origin (b) is a circle having centre at origin and radius 0 (c) is a circle having centre on x-axis and touching y-axis (iv) is a circle having centre on y-axis and touching x-axis