Circles

A closed figure that has curvilinear boundary is called as circle.

The diameter of the wheel of a car is $70 \mathrm{cm}$. How many revolutions will it make to travel $1.65 \mathrm{km}$?

Draw a circle with centre $O$ and radius $6 \mathrm{cm}$. Mark points $P,Q,R$ such that
$\left(i\right)$ $P$ lies on the circle.
$\left(ii\right)$$Q$ lies in the interior of the circle.
$\left(iii\right)$$R$ lies in the exterior of the circle.
Complete the following statements using the correct symbol:
$OP$ _____ $\mathrm{cm}$.

What is the longest chord of a circle?

If the radius of the circle is increased by $2$ times, then the diameter is increased by _____ times.

Is $\mathrm{XY}=2 \mathrm{OZ}$?

In the below table find the value of $x+y.$ $($Use $\mathrm{\pi }=\frac{22}{7})$

The point _____ is a point on the circle.

In the adjoining figure, $O$ is the centre of the circle. $CADBLC$ is the _____ of the circle.

How many radii are there in the given figure.

The length of boundary of a circle is called its _____.  $\left(circumference / Area / sector\right)$

Diameter of a circle is

Find the diameter of a circle if the radius is $11$ cm. If the answer is $K cm$ , then write the value of $K$ in the answer box.

Find the diameter of a circle if the radius is $6$ cm. If the answer is $K cm$ , then write the value of $K$ in the answer box.

Find the radius of a circle whose diameter is $10$ cm. If the answer is $K cm$ then write the value of $K$ in the answer box.

Find the radius of a circle whose diameter is $16$ cm. If the answer is $K cm$ then write the value of $K$ in the answer box.

Find the diameter of a circle if the radius is $4$ cm. If the answer is $K cm$ , then write the value of $K$ in the answer box.

All the radii of a circle are _____ in length.

The longest chord of a circle is called _____ of a circle.

Diameter of a circle is _____ $\times$ radius.