problem in 3 dimensions

The Great Pyramid of Cheops at Giza in Egypt has a square base of side length 230 m. The angle of elevation of one
triangular face is 52Β°. Determine the measure of the angle πœƒ between the height and one of the edges where two triangular faces meet.

Plz I really need help

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  1. The height h is found via
    h/115 = tan52Β°
    The diagonal of the base is 230√2
    sinπœƒ = (115 tan52Β°) / (115√2) = tan52Β°/√2

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