In a circle, the length of a minor arc is $110 \,cm$ and it subtends an angle of measure $150$ at the centre. Then, the radius of the circle is $\ldots \ldots \ldots \ldots cm$.
A wire fence is to be put up all around a circular ground with diameter $105\,m$. The length of the fence is $\ldots \ldots \ldots \ldots m$.
The circumference of a circle is $176 \,cm .$ Find its radius. (in $cm$)
Three circles each of radius $3.5\, cm$ are drawn in such a way that each of them touches the other two. Find the area enclosed between these circles. (in $cm ^{2}$)
The radius of a circle whose circumference is equal to the sum of the circumferences of the two circles of diameters $36\, cm$ and $20\, cm$ is (in $cm$)