Bond Angle of H2O

The bond angle of H2O is about 104.5 degrees.
WHY?
Because a tetrahedron has angles of 109.5 degrees, and the lone pairs of the oxygen provide a little bit of extra repulsion. Thus, the H's are pushed together just a little more than 109.5
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[@MuhammadAli-N.T.A]

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[@dzmitrym8028]

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[@helostinuniverseforever]

Is it a constant to substract 2.5 for lone pair .why can't we substract 2 for a lone pair instead