Complexes $\left({\mathrm{ML}}_5\right)$of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal geometries, respectively. The sum of the 90°, 120° and 180° L-M-L angles in the two complexes is____

${\mathrm{ML}}_5$ with Square pyramid.                           

          Contains eight 90° angle and two diagonal 180° angles (total=10).

         ${\mathrm{ML}}_5$ with TBP structure.

          Contains six 90° and three 120° and one 180°. So total = 10.

          Sum in both = 10 + 10 = 20.