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can some one help me
you do not know the shape of the base but you do knw the perimeter when you make the base int a prism you end up with a number of rectagular sides the height of EACH of these rectangles is 8 and the summ of ALL their widths is 20 so - what isa the area of all the side faces?
i already saw that it doesn't help
i know that but don't know how to get the answer
|dw:1449753823180:dw| you have a number of rectangular vertical faces the sum of their bases is 20, and ALL have a height of 8 so what is their area?
how do i get the answer
you can find the dimensions of the base by solving the system of 2 equations 2w + 2l = 20 lw = 21 wher l and w are the length and width i am assuming that the base is rectangular
so have a little think do a little work discuss your working here....
can u show how to do get the answer
@welshfella you cannot make that asumption and oyu do not need to all the sides bottom edges ADD to 20 all the sides height is 8 so you can work out the total area just from that info
can u show me how to get the answer
yes you can you do not know haow many edges there are but if they were of lenght a,b,c,d .... etc then the area of 1 side would be 8a, then 8b + 8 c etc 8a+8b + 8c +...... = 8(a+b+c+......) but you know that the sum of a+b+c+..... = 20 so there is the answer to the area of the sides
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Allright. A prism is a 3 faced structure made of equilateral triangles
@MrNood yes you are right
I assume by tagging all those people you are expecting one of them to give oyu the answer I have given you ALL except the last step to working outth esides The prism also has 2 identical ends - and oyu know the area of 1 end is 21
let one side be x. the perimiter of the base, 3x = 20
The surface area of a prism = 2 × area of base + perimeter of base × H
@dakid88 that is not correct a Prism is ANY polygon base shape - NOT just a triangle You are thinking of a pyramid My answer above works for ALL prisms
u are not showing me how to get to the last step
yes the answer is 2
go to tiger-algebra.com
a = the answer is not 2 b I am not giving you the last step because you are studying maths and the best way to learn is to DO just do what I gave you above work out the area of the sides, and then add the area of TWO ends
it shows you how to do it and it gives the answer
OR do a little work and feel a little self satisfaction and pride
i meant lead me to the last step
I have led you all the way: here it is again - you just need to make 1 step from here... you do not know how many edges there are but if they were of lenght a,b,c,d .... etc then the area of 1 side would be 8a, then 8b + 8 c etc 8a+8b + 8c +...... = 8(a+b+c+......) but you know that the sum of (a+b+c+....) = 20 so there is the answer to the area of the sides
it can only be 2.5 or 2.4
3 is the answer
i get it the closest answer is 3
you have not posted any options
there is no option
so - if the area of just 1 end is 21 HOW can the total be 3?
The total area of the sides of the prism = perimeter of the base * height (8)
I have told him that several times above - he is not even beginning to think about this I'm out
i don't get it
it is 2.5
@gibbs http://tiger-algebra.com/ does not help
fine check here http://www.mathpapa.com/algebra-calculator.html
@super123 do you want to understand this?
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imagine that the prism has no end bases and its made of thin cardboard if we cut vertically down the length and spread it out it would look like the following |dw:1449756104192:dw|
- rectangular piece of cardboard are 8 * 20 = 160 cm2 in area agreed?
yes so you just add on the areas of the 2 bases ( 2 times 21) and you have your answer
No 160 + (2 times 21) = ? do the multiplication first
yes 202 cm2 is correct
that is the answer
that is the answer
a medal 4 u and i will make a new ?
The assumption that the base is a rectangle can be made and the method of solving the system of equations will give the correct solution though it is a more involved method than the above.
@welshfella The fact is the answer is the same for ANY base shape from 3 to n sides you cannot 'assume' that the answer for 4 sides is true for ALL - but it IS true that the answer for ALL (as I gave) IS true for your assumption of rectangle. There is nothing in the question to say rectangle - so you are likely to make a mistake if you assume things that are not given
I was merely saying that the answer will be the same if you assume that the base is a rectangle.