The diagram shows a pyramid $$\(O A B C D\)$$. The pyramid has a square base, $$\(A B C D\)$$, with sides 10.5 cm . The vertex $$\(O\)$$ is vertically above the centre of the base, $$\(M\)$$. The height of the pyramid is 24 cm . Calculate the angle that $$\(O A\)$$ makes with the base. .............................................

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