We have to find the value of $\\cos\\theta$. I tried it alot. But could not able to do it. Solution given in the book

The Great Pyramid has a slope angle of approximately 51.83 degrees, an equilateral pyramid has a slope angle of 54.74 degrees, the Nubian pyramids have slope angles of about 72 degrees, and the Russian pyramids supposedly

In geometry, a pyramid (from Greek πυραμίς (pyramís) ) is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base. A pyramid with an n-sided base has n + 1 vertices, n + 1 faces, and 2n edges. See more

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