Terms Related to Circles

What is meant by concentric circle?

Priyanka finds this piece of a circular disc in her grandma’s trunk.

She wants to find the diameter of the disc.

What could Priyanka do to find the diameter of the disk?

Identify the figure that consists of concentric circles from figures $A,B,C$

Draw two concentric circles of radius $3 \mathrm{cm}$ and $5 \mathrm{cm}$. Construct a tangent to smaller circle from a point on the larger circle.

Two circles or more circles are called _____ circles if and only if they have same centre and different radii.

Concentric circles can have different centres.

In the given figure, identify the concentric circles and determine their properties. Explain how you arrived at your conclusion.

In the given figure, identify the non concentric circles.

The difference between the circumferences of two concentric circles is $132 \mathrm{cm}$ and the radius of smaller circle is $14 \mathrm{cm}.$ Find the radius of larger circle. [Take $\mathrm{\pi }=\frac{22}{7}$]

The diameter of two concentric circles is $10 \mathrm{cm}$ and $18 \mathrm{cm}$, respectively. Determine the area of enclosed between the two concentric circles.

Two concentric circles are of radii $17 \mathrm{cm}$ and $8 \mathrm{cm}$. Find the length of the chord of the larger circle which touches the smaller circle.

Two concentric circle of radius 3 cm and 4 cm, intersect in