3. The diameter of a circle is 21 cm. Find the length of its radius.

The diameter of a circle is 28 cm. Find its : area

. The diameter of a circle is 15cm. Find its radius.

The diameter of the circle is 52 cm and the length of one its chord is 20 cm. Find the distance of the chord from the centre.

The circumference of a circle is 132 cm. Find the length of its diameter.

The radius of a circle is 15cm. Find the length of its longest chord.

The diameter of a circle is 14 cm, find its radius.

The diameter of a circle is 9 cm, find its radius.

The diameter of a circle is 14cm, find its radius.