The height of a $TV$ transmitter antenna is $100 \ m$. What is the area covered by the transmitter for broadcasting? $(R = 6.4 \times 10^{6} \ m)$
- A$12.8\pi \times 10^{8} \ m^2$
- B$1.28\pi \times 10^{9} \ m^2$
- C$0.64\pi \times 10^{9} \ m^2$
- D$1.28\pi \times 10^{8} \ m^2$
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