The distance between two parallel tangents to a circle of radius $6 \mathrm{cm}$ is $14 \mathrm{cm}$.

The distance between two parallel tangents to a circle of radius $6 \mathrm{cm}$ is_____

If the angle between two tangents drawn from a point $P$ to a circle of radius $r$ and centre $O$ is $60°$, then $OP=$_____ $\times r$

In the figure, two circles with centres $A$ and $B$ touch each other externally at point $R$. The length of $PQ$(in $\mathrm{cm}$) is:

In the fig., $TQ$ is a chord of a circle and $TP$ is the tangent at $T$ such that $\angle QTP=60°$. Then $\angle TRQ$ is equal to

In the fig., if $PA=15 \mathrm{cm}$, then perimeter of $△PQR$ is

If two tangents inclined at an angle $60°$ are drawn to a circle of radius $3 \mathrm{cm}$, then length of each tangent is equal to

If radii of two concentric circles are $4 \mathrm{cm}$ and $5 \mathrm{cm}$, then the length of each chord of one circle which is tangent to the other circle is