If \(\left| {\vec a} \right| = 2,\;\left| {\vec b} \right| = 5\;and\left| {\vec a \times \;\vec b} \right| = 8\), then find the value of \(\vec a \cdot \;\vec b\)
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If \(\left| {\vec a} \right| = 2,\;\left| {\vec b} \right| = 5\;and\left| {\vec a \times \;\vec b} \right| = 8\), then find the value of \(\vec a \cdot \;\vec b\)