Intervisibility of Signal Towers There are three buildings: Alpha, Beta, and Gamma with elevations of 560 m, 525 m, and 500 m, respectively. Beta is in between Alpha and Gamma and is 11 km from Allpha and 13 km from Gamma. A. Considering the effect of curvature and refraction correction, what is the clearance or obstruction of the line of sight at Beta considering that Gamma is visible from Alpha. B. If a 5-meter tower is erected at top of Beta, what would be the height of equal towers to be erected at Alpha and Gamma in order that Alpha, Beta and Gamma will be intervisible. C. What should be the height of tower to be erected at Gamma so that Beta and Gamma will be intervisible from Alpha?

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