$\text{ Based on VSEPR theory, the number of precise }{90}^{\circ },\mathrm{F}-\mathrm{Br}-\mathrm{F}\text{ angles observed in }{\mathrm{BrF}}_5\text{ is }$

All four planar bonds (F-Br-F) will reduce from 90° to 84.8° after lp - bp repulsion.