Hi,

I have to calculate theta in the picture. anyone help me.

Thanks.

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- Mar 10th 2008, 01:22 AMkumarangle calculation
Hi,

I have to calculate theta in the picture. anyone help me.

Thanks. - Mar 10th 2008, 02:35 AMmr fantastic
- Mar 10th 2008, 08:53 AMNacho
- Mar 10th 2008, 09:13 PMkumar
Hi

Thanks for ur reply. ie. rectangle only and that horizondal line is in mid point only. for explanation only I drawn that lines. - Mar 11th 2008, 01:27 PMNacho
ok, as your problem haven`t numbers, theta only can find in function of the other angles, as the picture show, we say that:

$\displaystyle

\begin{gathered}

\sphericalangle CAB = \alpha \hfill \\

\sphericalangle CBA = \beta \hfill \\

\sphericalangle CBD = \theta \hfill \\

\hfill \\

\alpha + \beta + 90 = 180 \Leftrightarrow \alpha + \beta = 90 \hfill \\

\end{gathered}

$

now

$\displaystyle

\beta + \theta = 180 \Leftrightarrow \boxed{\theta = 180 - \beta }

$

but remember that

$\displaystyle

\begin{gathered}

\alpha + \beta = 90 \Leftrightarrow \beta = 90 - \alpha \hfill \\

\hfill \\

\therefore \theta = 180 - \beta \Leftrightarrow \theta = 180 - \left( {90 - \alpha } \right) \hfill \\

\boxed{\theta = 90 + \alpha } \hfill \\

\end{gathered}

$

I hope that you understand it :)

if you question continue, only post it

P.D: sorry for my bad english - Mar 12th 2008, 10:55 PMkumar
Thanks Nacho