The length of the shadows of a vertical pole of height \( h \), thrown by the sun's rays at thre....

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The length of the shadows of a vertical pole of height \( h \), thrown by the sun's rays at three different
\( \mathrm{P} \)
moments are \( h, 2 h \) and \( 3 h \). The sum of the angles of
W
elevation of the rays at these three moments, is equal to
(1) \( \frac{\pi}{2} \)
(2) \( \frac{\pi}{3} \)
(3) \( \frac{\pi}{4} \)
(4) \( \frac{\pi}{6} \)



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