mathslover
Please help in this question :
Calculate the area of the shaded region



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mathslover
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Denebel
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Is the 15 the length from BC?

mathslover
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Ok so this is an easy question but my problem is that :how do I find the area of triangle AOD

mathslover
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Yes denebel

hartnn
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AOD isn't a triangle ....is it?
u meant ACD?

mathslover
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OH i meant triangle OBD

hartnn
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isn't BO perpendicular to AD ?

mathslover
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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
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it only goes find area of triangle AOB and then area of triangle ABC
and then subtraction as u know

mathslover
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Is that right step?

hartnn
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u mean Area of ABCABD ?

mathslover
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ar of ABC  ar ABO

mathslover
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that is mentioned by : the book
and i think where does BOD go ..

hartnn
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thats not correct to find area ADC
it must be ABCABD=ABCABOBOD

mathslover
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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
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yup, either of the two is incorrect.

mathslover
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ok thankss