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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Trignometry
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The angles $A,B$ and $C$ of a triangle ABC are in arithmetic progression.If $2b^2=3C^2$ determine the angle A


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Step 1:
Since $A,B,C$ are in A.P
Step 2:
Given :
$\sin C=\large\frac{1}{\sqrt 2}$
$C=\sin^{-1}\large\frac{1}{\sqrt 2}$
Step 3:
Hence $A=180^{\large\circ}-(B+C)$
On substituting B & C we get,
Hence (c) is the correct answer.
answered Oct 21, 2013 by sreemathi.v

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