mathslover
  • mathslover
Please help in this question : Calculate the area of the shaded region
Mathematics
katieb
  • katieb
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mathslover
  • mathslover
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anonymous
  • anonymous
Is the 15 the length from BC?
mathslover
  • mathslover
Ok so this is an easy question but my problem is that :how do I find the area of triangle AOD
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mathslover
  • mathslover
Yes denebel
hartnn
  • hartnn
AOD isn't a triangle ....is it? u meant ACD?
mathslover
  • mathslover
OH i meant triangle OBD
hartnn
  • hartnn
isn't BO perpendicular to AD ?
mathslover
  • mathslover
NOTE : I have solution but the answer given by the soln is totally wrong acc. to me I know that hartnn but... the soln does not go through that step
mathslover
  • mathslover
it only goes find area of triangle AOB and then area of triangle ABC and then subtraction as u know
mathslover
  • mathslover
Is that right step?
hartnn
  • hartnn
u mean Area of ABC-ABD ?
mathslover
  • mathslover
ar of ABC - ar ABO
mathslover
  • mathslover
that is mentioned by : the book and i think where does BOD go ..
hartnn
  • hartnn
thats not correct to find area ADC it must be ABC-ABD=ABC-ABO-BOD
mathslover
  • mathslover
yes very right ... but the book was 'reliable' so I thought it may contain some trick so either figure is wrong or the soln right?
hartnn
  • hartnn
yup, either of the two is incorrect.
mathslover
  • mathslover
ok thankss

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