A) 12 cm
B) 18 cm
C) 21 cm
D) None of the above
Correct Answer: A
Solution :
Here, length of the arc of the sector\[=2\pi R\left( \frac{0}{{{360}^{\circ }}} \right)\] Also, circumference of the cone = 27\[\pi \]r \[2\pi r=2\pi \times 30\times \frac{{{144}^{\circ }}}{{{360}^{\circ }}}\] \[\Rightarrow r=\frac{30\times {{144}^{\circ }}}{{{360}^{\circ }}}=\]You need to login to perform this action.
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