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Mathematics 10 Online
OpenStudy (anonymous):

Geometry, please explain how you got the answer.

OpenStudy (jdoe0001):

it was blowing in the wind =)

OpenStudy (jdoe0001):

you can show pictures here too you know, see the [Attach File] blue button?

OpenStudy (anonymous):

would you like a photo?

OpenStudy (jdoe0001):

preferably, yes, because there, I can't tell what's 6.99 or what's 3.5

OpenStudy (anonymous):

k one sec

OpenStudy (anonymous):

OpenStudy (anonymous):

its question 19

OpenStudy (jdoe0001):

|dw:1378764169648:dw| you get the are of the FACING TRIANGLE first, and then multiply it by the HOW THICK IT'S running down to the other triangular face and that would be the volume

OpenStudy (anonymous):

please explain again

OpenStudy (jdoe0001):

ok... you know what the area of a triangle is?

OpenStudy (anonymous):

ya i got it

OpenStudy (jdoe0001):

\(\bf \textit{area of a triangle } = \cfrac{1}{2} \times base \times height \implies \cfrac{1}{2} \times 83.88 \times 83.88\)

OpenStudy (anonymous):

k what next

OpenStudy (jdoe0001):

times 13.5

OpenStudy (anonymous):

ok 329.805675 now what?

OpenStudy (jdoe0001):

well, I got ... a bigger number but that will be the value of the filling

OpenStudy (anonymous):

but the right answer is 27.5ft i just dont know how to get it

OpenStudy (jdoe0001):

yes, because I used inches, the base and height are in feet, the filling thickness is in inches

OpenStudy (jdoe0001):

\(\bf \textit{volume of the filling } = \left(\cfrac{1}{2} \times 83.88 \times 83.88\right) \times 13.5\)

OpenStudy (anonymous):

oooooooooooooooooo i get it ok thank you!!!!

OpenStudy (jdoe0001):

to convert to inches, just divide it by \(\begin{array}{llll} 1ft & = & 12in\\ 1ft^2 & = & 12^2in^2\\ 1ft^3 & = & {\bf 12^3}in^3 \end{array}\)

OpenStudy (jdoe0001):

by \(\bf 12^3\)

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