Consider the vectors \(\rm\overline a = 3\overline i + 5\overline j + 2\overline k, \overline b = 2\overline i - 3\overline j - 5\overline k \) and \(\rm \overline c = -5\overline i - 2\overline j + 3\overline k \). If l, m and n are length of  projections  of \(\overline{a}\) on \(\overline{b}\), \(\overline{b}\) on \(\overline{c}\) and \(\overline{c}\) on \(\overline{a}\) respectively, then