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#### Petrus

##### Well-known member

- Feb 21, 2013

- 739

Hello MHB,

I am working with a exemple that I think they got some incorrect.

Exemple 10.Show that diagonals in a diamond(romb) is orthogonal.

I understand that \(\displaystyle AC•BD=0\) cause of dot product and if it's orthogonal the angle is \(\displaystyle \frac{\pi}{2}\)

I understand all the part until the step before the last one

Edit: last part got cut in picture, it should be: \(\displaystyle |BC|^2-|AB|^2=0\)

Regards,

\(\displaystyle |\pi\rangle\)

I am working with a exemple that I think they got some incorrect.

Exemple 10.Show that diagonals in a diamond(romb) is orthogonal.

I understand that \(\displaystyle AC•BD=0\) cause of dot product and if it's orthogonal the angle is \(\displaystyle \frac{\pi}{2}\)

I understand all the part until the step before the last one

Edit: last part got cut in picture, it should be: \(\displaystyle |BC|^2-|AB|^2=0\)

Regards,

\(\displaystyle |\pi\rangle\)

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