anonymous
  • anonymous
Can someone help me with Geo Problem! Diagonal AC divides a trapezoid ABCD two similar triangles ABC and ACD. Find AC if BC=4cm and AD=9cm
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@ganeshie8 I need help
anonymous
  • anonymous
@ghazi @lalaly @AccessDenied
anonymous
  • anonymous
Are these triangles similar by area?

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More answers

anonymous
  • anonymous
Is not there any fig. for this?
campbell_st
  • campbell_st
I think it looks like this|dw:1356206771435:dw| the angles marked x are equal by alternate angles in parallel lines
ghazi
  • ghazi
|dw:1356207039082:dw|
anonymous
  • anonymous
Now what do i do?
ghazi
  • ghazi
have you provided whole information?
anonymous
  • anonymous
yes
anonymous
  • anonymous
I think there is something we r missing..
campbell_st
  • campbell_st
well the corresponding sides in the triangles are triangle ABC and triangle ACD are AB AC AB DC BC AD now you need to use the ratio's of corresponding sides in similar triangles
anonymous
  • anonymous
but ques. does'nt say that it divides the triangles in equal areas!
anonymous
  • anonymous
that's wat i was confirming earlier
anonymous
  • anonymous
AD:BC = 2.25
anonymous
  • anonymous
SIMILARITY CAN ONLY BE USED WHEN AREAS ARE EQUAL
campbell_st
  • campbell_st
oops corresponding side should be AC and DC so using the ratio of corresponding sides \[\frac{4}{9} = \frac{AB}{AC}= \frac{AC}{ DC}\]
anonymous
  • anonymous
what happens next?
anonymous
  • anonymous
@campbell_st
campbell_st
  • campbell_st
who knows.... it doesn't make sense to me... there seems to be something missing from the question.
campbell_st
  • campbell_st
Oh, and triangles can be similar and have different areas the ratio will be the linear ratio squared. so the ratio of areas in the triangles is ABC:ACD = (4/9)^2
anonymous
  • anonymous
@ghazi is there missing info?
ghazi
  • ghazi
i am confused
anonymous
  • anonymous
wat r u confused about?
ghazi
  • ghazi
there is something missing in it

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