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Find the condition for which |vecA+vecB...

Find the condition for which `|vecA+vecB|=|vecA-vecB|` ?

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`|vecA+vecB|^2=|vecA-vecB|^2`
or, `A^2+B^2+2AB cos theta =A^2+B^2-2ABcos theta`
`or, 4AB cos theta =0 or, cos theta =0 =cos 90^@ or , theta =90^@`
`therefore` The condition is , `vecA bot vecB`.
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