Saturday

December 20, 2014

December 20, 2014

Posted by **noor** on Monday, April 27, 2009 at 10:00am.

- math -
**Reiny**, Monday, April 27, 2009 at 10:47amby "area of a 3D prism" , do you mean the surface area of the shape, or did you mean volume ?

Either way, you will have to be much more specific as to the kind of prism you are referring to.

In general, the surface area would be the total of the areas of all the faces.

in general the volume is (the area of the base)x(the height).

- math -
**Dr Russ**, Monday, April 27, 2009 at 10:52amThere are a number of prism shapes. In all cases the surface area of a prism is the area of the ends plus the area of the sides.

Lets look at a regular triangle prism (i.e. a toblerone shape) with sides a and length l. The ends are equilitaeral triangles so the area is

a^2root3/4

(area of triangle is 0.5xbasexheight, height of equlateral triangle is axroot3/2 so area is a/2 x a x root3/2)

The three sides of the prism are all rectangles, area=al

so the surface area of the prism is

2(a^2root3/4)+3al

But check my maths!

You can do the same for each shape of prism.

**Answer this Question**

**Related Questions**

Math 115 - I need help with these problems 1. 18kg=______g I don't understand ...

English: Shakespeare-Othello - i need help please. idont understand this ...

GEOMETRY - the correct half–plane in each case, Y>3 I AM TRYING TO GRAPH THIS...

Math - I have a matrix with brackets around [7 6 ][13] [14 -6] [8] and i know ...

math - i dont understand how this is supposed to be layed out and how to do it ...

Algebra - I am having such a hard time in this class. Hopefully someone here can...

history - I dont understand this question: the removal of general mcclellan ...

history - I dont understand this question: the removal of general mcclellan ...

Math - how do i figure out this equation? Joy knits a square blanket that has an...

Math - How do I figure out -144/4 to find out if it is a natural number,a whole ...