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A TV transmitted antenna is 80m tall. If the receiving antenna is on the ground the services are is

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12 Sq km

144 Sq km

3215 Sq km

32 Sq km

answer is C.

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Detailed Solution

$A r e a = π d^{2} (∴ d = \sqrt{2 R h_{R}})$

$= π (2 R h_{R})$

$= 3.14 \times 2 \times 6400 \times 80 \times 10^{- 3}$

$= 3215 s q . k m$

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