Assertion(A) : Two identical balls A and B thrown with same velocity ‘u’ at two different angles with horizontal attained the same range R. If A and B reached the maximum height ${\text{h}}_1$ and  ${\text{h}}_2$ respectively, then $\mathrm{R}=4\sqrt{{\mathrm{h}}_1{\mathrm{h}}_2}$  
Reason(R) : Product of said heights ${\mathrm{h}}_1{\mathrm{h}}_2=\left(\frac{{\mathrm{u}}^2{\sin }^2\mathrm{\theta }}{2\mathrm{g}}\right).\left(\frac{{\mathrm{u}}^2\mathrm{cos\theta }}{2\mathrm{g}}\right)$