Basically this is because each of the electron pairs in a carbon atom tends to get away as far as possible from each of the other three electron pairs.
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They do not have the same solid angles. Also, CH4 has five atoms while H2O has three.
CH4 has no lone pairs.So it is tetrahedral.
The geometry of Methane (CH4) is tetrahedron or tetrahedral
in water there are two bond pairs and two lone pairs where as in CH4 there are are four bond pairs nad no lone pair. in ch4 there is only bond pair to bond pair repulsion but in water there are three types of repulsions, lone to lone (greatest repulsion), lone to bond ( lesser repulsion ) and bond to bond ( the least repulsion) , therefore due to the presence of two lone pairs in water the bond pairs are repelled with greater force and they get compressed, reducing the ideal bond angle from 109.5 to 104.5 on the other hand, ch4 has only bond pairs and they dont repel each other that strongly so its angle is greater n its 109.5..
Molecular geometry is tetrahedral has no lone pairs