Q62

i did this but don'tknow what values to put for A,C ans is C# Doubt from Solution of triangle

as you did write 2\cot(\frac{B}{2}) =\cot(\frac{A}{2}) + \cot(\frac{C}{2}) and add \cot(\frac{B}{2}) on both sides and use the identity \\ \cot(\frac{B}{2}) \cot(\frac{A}{2}) \cot(\frac{C}{2}) = \cot(\frac{B}{2}) +\cot(\frac{A}{2}) +\cot(\frac{C}{2})

to get \cot(\frac{A}{2}) \cot(\frac{C}{2}) = 3

which gives you the answer

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use \displaystyle r = \frac{\Delta}{s}

s = 40,\Delta = 18`by Heron's formula`

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