Mathematics
14 Online
OpenStudy (anonymous):
help please
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OpenStudy (anonymous):
OpenStudy (anonymous):
@sammixboo
sammixboo (sammixboo):
I can't pen the file
OpenStudy (anonymous):
Split it into three rectangles
OpenStudy (anonymous):
|dw:1430945293240:dw|
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OpenStudy (anonymous):
for rectangle one, what are the side lengths?
OpenStudy (anonymous):
umm i don't know
OpenStudy (anonymous):
|dw:1430945552418:dw|
OpenStudy (anonymous):
what is the side length labelled x. It's on the original figure.
OpenStudy (anonymous):
it's 12, do you see how i got that?
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OpenStudy (anonymous):
yes
OpenStudy (anonymous):
ok, so what is the other side of the rectangle?
OpenStudy (anonymous):
12?
OpenStudy (anonymous):
nope, it's 23.
OpenStudy (anonymous):
oh sorry that was going to be my second answer...
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OpenStudy (anonymous):
so now we know the sides are 12 and 23. now find the area of the first rectangle
OpenStudy (anonymous):
12 x 23
OpenStudy (anonymous):
276
OpenStudy (anonymous):
yep. so what can we say about rectangles 1 and 3?
OpenStudy (anonymous):
they are the same?
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OpenStudy (anonymous):
that's right
OpenStudy (anonymous):
now lets solve rectangle 2
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
what's 31-12?
OpenStudy (anonymous):
19
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OpenStudy (anonymous):
|dw:1430946712343:dw|
OpenStudy (anonymous):
what is x?
OpenStudy (anonymous):
69
OpenStudy (anonymous):
ok, so what's the area of rectangle 2?
OpenStudy (anonymous):
1,311?
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OpenStudy (anonymous):
yep, so add up the 3 areas we found to get the final answer
OpenStudy (anonymous):
so 1,311 + 276+276?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
1,863
OpenStudy (anonymous):
that's right, good job
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OpenStudy (anonymous):
thank you
OpenStudy (anonymous):
no problem