SURFACE AREA OF COMPOSITE SOLID.

[madiiiiss]

Hi! I need help to work out the surface area of this composite solid. The cylinder is open meaning it is hollow in the middle. What is a simple way to work this out?

 

[The Highlander]

View attachment 31426Hi! I need help to work out the surface area of this composite solid. The cylinder is open meaning it is hollow in the middle. What is a simple way to work this out?

Hi madiiiiss,

Your cylinder looks just like the cardboard centre of a kitchen roll once all the sheets have been used. What would you get if you cut straight up the side and flattened it out?

The attached picture may also help you with the rest.

Show us how you attempt to answer the problem now and we will offer further help if needed.

 

[Deleted member 4993]

View attachment 31426Hi! I need help to work out the surface area of this composite solid. The cylinder is open meaning it is hollow in the middle. What is a simple way to work this out?

Is that toroidal hole inside a right prismatic box with rhombus as two side-faces ?

 

[The Highlander]

Is that toroidal hole inside a right prismatic box with rhombus as two side-faces ?

It looks to me like the ends are parallelograms and the four sides rectangular?
But I wonder if the dimension indicated below may have been supplied in the original?