I need help with a math problem

timer Asked: Nov 12th, 2015
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Question Description

Tutor Answer

Alex Maslovskii
School: UC Berkeley

Thank you for the opportunity to help you with your question!

A cone is a three - dimensional geometric figure  that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apexor vertex.

It has one bace and one lateral face

Cross section parallel to base has the same shape, as bace (circular)

Cross section perpendicular to base is triangle 

Еo find the total surface area of the cone , we must find the area of ​​the side surface (lateral face) and the base.

Formula of cone side surface (Ssf) is Ssf= pi*r*l   where cone.JPG 

Formula of cone base (Sb) is Sb= pi*r^2 

Formula of total surface area(St) is St= Ssf+Sb

Formula of cone volume is Vc= 1/3 *pi*r^2*H where h is height of cone

Please let me know if you need any clarification. I'm always happy to answer your questions.

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