lf D is thedaneter of the brger circle and d the diameter of the small circle then `D+d=?`

In the figure given below, D is the diameter of each circle. What is the diameter of the shaded circle ?

The radii of two concentric circle are 13 cm and 8 cm. AB is a diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E. Point A is joined to D. Find the length of AD.

The radii of two concentric circles are 13 cm ad 8 cm. AB is a diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E. Point A is joined to D. The length of AD (in cm) is___

The radii of two concentric circles are 13 cm and 8 cm. AB is a diameter of the bigger circle. BD is a tangent to the smaller circle touching it at D. Find AD.

If the diagram, D C is a diameter of the large circle centered at A , and A C is a diameter of the smaller circle centered at B . If D E is tangent to the smaller circle at F and D C=12 then the length of D E is .

If the diameter of a circle is d, then its perimeter is

What is the area of a circle with diameter d?

A diameter (d) of a circle is twice the radius (r) of the circle?