anonymous
  • anonymous
The figure below shows two similar right triangular prisms. What is the volume of Prism B rounded to the nearest hundredth cubic unit?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@phi
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anonymous
  • anonymous
@Agent_Sniffles @amistre64 @jim_thompson5910 @Hero
phi
  • phi
two similar right triangular prisms. SIMILAR means that the ratio of their sides are the same number for example, look at the shortest side of the big prism and divide it by the length of the shortest side in the smaller prism what do you get?

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anonymous
  • anonymous
.56
anonymous
  • anonymous
or 1.8... idk which
phi
  • phi
I meant 9/6 = 3/2 or 1.5 now look at the other leg: the longer side of the big prism is 10.5 divide this by the corresponding side of the other prism what do you get?
anonymous
  • anonymous
ohhh okay
anonymous
  • anonymous
1.5
phi
  • phi
now what do you think the (unknown) height (call it h) divided by 5 is ? h/5 = 1.5 (the same ratio) now find h
anonymous
  • anonymous
7.5?
phi
  • phi
yes. why the ? Is your calculator broken? But now you can find the volume of the big prism volume of Prism B is the area of its base (it's a triangle) times its height (just found to be 7.5) can you find the area of the base? then multiply by the height 7.5 to get the volume
anonymous
  • anonymous
how do i find the area of the base?
phi
  • phi
didn't you just do the area of a triangle in the last question?
anonymous
  • anonymous
is it b*h/2? My lesson isn't very clear on what's what....
phi
  • phi
yes base times height divided by 2 base is one of the legs, the height (or altitude) is the line perpendicular to the base . The height makes a 90 angle with the base. In your picture, that little square in the corner of the 2 legs means 90 deg so your base and height are the 2 legs in the triangle.
anonymous
  • anonymous
the base is 47.25 then. Right?
phi
  • phi
Examples |dw:1349210955962:dw|
phi
  • phi
base is 47.25 then. Right? I would say area of the base (of the prism) (there is also the base of the triangle, which is just 1 leg) Area of the base is 0.5*9*10.5= 47.25 now find the volume by multiplying that by the height of the prism
anonymous
  • anonymous
didnt you just do that?
anonymous
  • anonymous
or do i multiply 47.35*9?
anonymous
  • anonymous
*47.25 sry typo
phi
  • phi
don't lose track of what we are doing 1) we found the h using the idea of similar figures. h= 7.5 2) we found the area of the base of the prism A= 47.25 3) we find the volume by multiplying A*h
anonymous
  • anonymous
354.375
anonymous
  • anonymous
or 354.38 if we round up
phi
  • phi
This question took a few steps, and you need to know a few facts...
anonymous
  • anonymous
ok

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