as usual, google is your friend. Start with these results:
https://www.google.com/search?client=firefox-b-1-d&q=methane+molecule+bond+angles
6. In the methane molecule, each carbon atom is surrounded by four hydrogen atoms, which form a tetrahedron, with the carbon atom at its center. The bond angle is the angle formed by the H-C-H combination. Find the tetrahedron angle . Take the C atom to be at (1/2,1/2,1/2) and the hydrogen atoms at (1,0,0), (0,1,0),(0,0,1).
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