anonymous
  • anonymous
In the figure, E is the midpoint of side CB of rectangle ABCD and x=45. AB is 3 cm, what is the area of rectangle ABCD, in square cm
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
which figure?
anonymous
  • anonymous
you can take a picture of the rectangle from your book and attach it as a file here
anonymous
  • anonymous
uploading it now

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anonymous
  • anonymous
Okay, AB is 3 cm, And x or DE is 45 cm.
anonymous
  • anonymous
so if AB is 3 cm, what is the length of DC?
anonymous
  • anonymous
are you thinking about it?
anonymous
  • anonymous
dc is 3
anonymous
  • anonymous
and i don't think de is 45 cm
anonymous
  • anonymous
In the figure above, E is the midpoint of side CB of rectangle ABCD, and ∠x = 45°. If AB is 3 centimeters, what is the area of rectangle ABCD, in square centimeters?
anonymous
  • anonymous
I see x is the angle ade
anonymous
  • anonymous
right
anonymous
  • anonymous
okay, angle ADE is 45, what is the angle CDE?
anonymous
  • anonymous
i think DC IS 3 and CE is also 3
anonymous
  • anonymous
45-45-90 triangle
anonymous
  • anonymous
okay good. I hope you got that tan 45 = CE/DC
anonymous
  • anonymous
alright. So if CE is 3 cm and E is the midpoint of CB, what is the length of CB?
anonymous
  • anonymous
6
anonymous
  • anonymous
great! so what is the area of the rectangle?
anonymous
  • anonymous
18
anonymous
  • anonymous
yes, you should say 18 sq.cm though, because length and breadth are in cms.
anonymous
  • anonymous
thank you very much
anonymous
  • anonymous
you are welcome.

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