The length of the diameter of a circle is twice the length of its radius.

Sector of a circle is the part of a circular area.

Arc of a circle is the part of a circle.

Center of a circle is a fixed point in a circle.

Two diameters of a Circle always intersects each other.

With the help of a compass and a pencil a $3 \mathrm{cm}$ circle is drawn. Let's name its center, radius, diameter, chord, arc.

Identify the major sector and the minor sector from the given figure.

The radius of two circles are 2cm, 4cm respectively. let's write the length of their diameter without measuring.

If the greatest chord of the circle is 10 cm then find the length of its radius.