A Television transmitting antenna is 84 m tall. How much service area can it cover, if the receiving antenna is at the ground level ?  (Given $\pi=\frac{22}{7}$)

721 km2 1075 km2 1690 km2 3379 km2

3379 km2

Area covered is $ A = \pi d^2 = \pi \times 2RH = 2\times \frac{22}{7} \times 6400\times 10^3 \times 84 = 3379 km^2$