What is the surface area of the rightcone below ?

458,487 views

33 votes

3.1k points

Your comment on this question:

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Email me at this address if my answer is selected or commented on:Email me if my answer is selected or commented on

Privacy: Your email address will only be used for sending these notifications.

6 votes

The expression to calculate the surface area of a right cone is,

$SA=\pi* r^2+\pi rl$

From the figure, r=3 cm and l= 15 cm.

$\begin{gathered} S\mathrm{}A=\pi*3^2+\pi*3*15 \\ =9\pi+45\pi \\ =54\pi unit^2 \end{gathered}$

Thus, the surface area of the right cone is 54 square unit and the correct option is option B.

2.9k points

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

1.6m questions

2.0m answers