question_answer

The height and radius of a cone are 3 cm and 4 cm respectively. Its curved surface area must be is

A)  \[2\pi \]        

B)  \[{{120}^{o}}\]

C)  \[9\frac{3}{7}\]                     

D)  \[P%\]

Correct Answer: A

Solution :

Curved surface area of a cone \[50\sqrt{2}cm\] Also, as shown in diagram, \[5\sqrt{3}\] or \[c{{m}^{2}}\] \[c{{m}^{2}}\] \[\frac{77}{2}\]