A TV tower has a height of 150m.The area of the region covered by the TV broadcast is (Radius of earth = $6.4\times {10}^{6}m$ )

$\begin{array}{l}h=150m,R=6.4\times {10}^6\text{m}\\ \\ \text{ Distance upto which the transmission could be viewed }\\ d=\sqrt{2hR}\\ \text{ Total area over which transmission could be viewer }=\pi d^2=2\pi hR=1920\mathrm{\pi }\times {10}^6{\mathrm{m}}^2=1.92\mathrm{\pi }\times {10}^3{\mathrm{km}}^2\end{array}$