+0  
 
0
56
1
avatar+406 

use 3.14 for PI. Plz help.

Donut  Mar 20, 2018
edited by Donut  Mar 20, 2018

Best Answer 

 #1
avatar+6949 
+2

lateral area of cone   =   pi * slant height * radius of the base

 

The radius of the base is  3  inches.

It looks like  6 inches  is the slant height.

 

lateral area of cone   =   pi * 6 * 3   in2

lateral area of cone  =   18pi   in2

 

lateral area of cylinder   =   circumference of base * height

lateral area of cylinder   =   2pi * radius of base * height

 

The radius of the base is  3 inches.

The height is  5 inches.

 

lateral area of cylinder   =   2pi * 3 * 5  in2

lateral area of cylinder   =   30pi  in2

 

area of base   =   pi * radius2

area of base   =   pi * 32   in2

area of base   =   9pi  in2

 

total surface area   =   lateral area of cone + lateral area of cylinder + area of base

total surface area   =   18pi  in2   +   30pi  in2   +   9pi  in2

total surface area   =   57pi  in2

total surface area   ≈   57(3.14)  in2

total surface area   ≈   178.98  in2

hectictar  Mar 20, 2018
Sort: 

1+0 Answers

 #1
avatar+6949 
+2
Best Answer

lateral area of cone   =   pi * slant height * radius of the base

 

The radius of the base is  3  inches.

It looks like  6 inches  is the slant height.

 

lateral area of cone   =   pi * 6 * 3   in2

lateral area of cone  =   18pi   in2

 

lateral area of cylinder   =   circumference of base * height

lateral area of cylinder   =   2pi * radius of base * height

 

The radius of the base is  3 inches.

The height is  5 inches.

 

lateral area of cylinder   =   2pi * 3 * 5  in2

lateral area of cylinder   =   30pi  in2

 

area of base   =   pi * radius2

area of base   =   pi * 32   in2

area of base   =   9pi  in2

 

total surface area   =   lateral area of cone + lateral area of cylinder + area of base

total surface area   =   18pi  in2   +   30pi  in2   +   9pi  in2

total surface area   =   57pi  in2

total surface area   ≈   57(3.14)  in2

total surface area   ≈   178.98  in2

hectictar  Mar 20, 2018

23 Online Users

avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details