Problem

Problem

In a cubical hall ABCD,PQRSABCD, PQRS with each side 10 m, GG is the centre of the wall BCRQBCRQ and TT is the mid-point of the side ABAB. The angle of elevation of GG at the point TT is a. sin⁡−1(13)\sin^{-1}\left(\frac{1}{\sqrt{3}}\right) b. cos⁡−1(13)\cos^{-1}\left(\frac{1}{\sqrt{3}}\right) c. tan⁡−1(13)\tan^{-1}\left(\frac{1}{\sqrt{3}}\right) d. cot⁡−1(13)\cot^{-1}\left(\frac{1}{\sqrt{3}}\right)

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