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that picture doesn't look right, height is already there in the picture
i copied it directly from the page. which number is the height? i thought the same but wanted to make sure
height = distance between triangular bases
but which number is it? there are 2 numbers next to the height
nm. its 13 right?
distance between the triangular bases is 20cm right
is that the height of the box?
i thought that was the length
Yes thats the height of the box
I think they want they want the length of this segment here |dw:1436232861596:dw|
thats the height of base, not box
if so, then focus on this triangle |dw:1436232912171:dw| imagine looking directly at this triangle |dw:1436232983737:dw|
is it 12?
yeah because we have a 5-12-13 right triangle |dw:1436233124402:dw|
that is of course, assuming that's what they meant by "height"
so it Is 12?
thx. but i dont understand part b
you have 3 lateral sides Right face |dw:1436233275185:dw|
left face (hidden) |dw:1436233294238:dw|
and the bottom face (also hidden) |dw:1436233324795:dw|
they are the lateral faces
find the area of each lateral face, then add up the areas
how would i find the area of the lateral faces?
each is a rectangle
for instance, the bottom face is a 10 by 20 rectangle
do the same for the other rectangles
also, don't forget about the triangles as well
how did we get 12 again?
for part a
did you randomly guess 12?
you were the first one to write it
no. i did some random equations and it sounded right to me
That's the pythagorean theorem
for part b it says approximate though. do we have to round?
if we dont round, i got 850 for part b
not always approximate just means that it's some decimal that usually goes on forever example: 1/7 = 0.14285714285714 the "142857" repeats forever over and over. So one approximation of 1/7 is 0.14286. Another approximation is 0.1429
so yeah I guess in a way, you are rounding
is 850 correct?
close but no
what is it?
how did you get 850? can you show your work?
yes. hold on a sec
the triangle portion is where you made an error
each triangle has a base of 10 and height of 12
oh right!!! i forgot about that part. hold on so i can fix it.
840 is the correct answer
yep, 840 square cm
is it squared or cubed?
surface area deals with square units (not cubic units)