math
posted by noor .
hey i need to understand how to figure out an area of a 3D prizm. sreached on the web but don't understand it please help

by "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). 
There 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.
Respond to this Question
Similar Questions

math
3x6 2x30 = 2x+12 ______  _______ _______ x3 3x9 x3 sx= (24) I have the anwser but I just cant figure out how to do it. I hava a huge exam in October yet this is not evan a quarter of what I have to learn. Im teaching myself I … 
GEOMETRY
the correct halfâ€“plane in each case, Y>3 I AM TRYING TO GRAPH THIS I HAVE THE LINE THROUGH THE LINE THREE ABOVE THE X GOING STRAIGHT ACROSS WHAT ELSE DO I NEED TO DO I KNOW I NEED TO SHADE ONE SIDE OR THE OTHER BUT HAVE NOT BEEN … 
Algebra
I am having such a hard time in this class. Hopefully someone here can help me to understand some of what they are trying to teach me. I have a problem here and have been working on it for about an hour now and I can not figure it … 
Math
I have tried to figure out this problem and I just don't seem to understand. Could someone please help? 
Chemistry
Calculate the average translational kinetic energy (kJ/molecule) for a molecule of NH3 at 431 K, assuming it is behaving as an ideal gas. I understand how to figure out the kJ/mole, but I don't understand how to get the kJ/molecule … 
Math 115
I need help with these problems 1. 18kg=______g I don't understand this. 2.1kg=______oz. can't figure this out. 3.20lb=______oz can't figure this out. 4.461mm=______m don't know where to begin. Can some please help me understand these … 
English: ShakespeareOthello
i need help please. idont understand this question. as he enter desdemona's bedchamber in order to kill her, othello mutters: it is the cause, it is the cause, my soul. what is he talking about? 
math
How many two digit numbers are there in base 5. I really don't understand how to figure this out. I know it's been asked already, but I still don't understand it. 
Science and Math Combined
Can someone please help me understand how I figure out how much electricity I used when using a small appliance (lets say 300 watts. For the duration of 3 hours? 
Math
How do I figure out 144/4 to find out if it is a natural number,a whole number, an interger, if it is a rational or irrational number,or a real number?