Class 12 Book Solution from S N Dey in Product of Two Vectors Question No: 26.2A.3.4

\(\overrightarrow{a}\), \(\overrightarrow{b}\)এবং \(\overrightarrow{c}\) তিনটি ভেক্টর এমন যে, \(\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c}=\overrightarrow{0}\); যদি \(|\overrightarrow{a}|=3\), \(|\overrightarrow{b}|=4\) এবং \(|\overrightarrow{c}|=5\) হয়, তবে দেখাও যে, \(\overrightarrow{a}.\overrightarrow{b}+\overrightarrow{b}.\overrightarrow{c}+\overrightarrow{c}.\overrightarrow{a}=-25\)

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