Mathematics, 08.05.2021 14:00, boomerjm

Can someone help slove this, thanks. Someone measured the elevation angle of a mountain at a point on flat ground to be 45°. After walking (a) meter towards the front of the mountain, he measured the elevation angle of the mountain to be 60 °. If the height of the mountain is h, prove that
h = (3 + sqrt{3} )a

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Can someone help slove this, thanks. Someone measured the elevation angle of a mountain at a point...