Why the tetrahedron is equal to the angle of 109.5degrees but it says in an article that if you divide the number of bonds thats the angle but when i divide 4 to 360 the answer is 90 they did not match pls answer my question tnx?
A tetrahedron is not flat...
If you have a flat symmetrical molecule such as Borane
You could model the shape by imagining a carbon atom at
Then the angle between the line joining
#arccos((<1,1,1> . <1,-1,-1>)/(abs(<1,1,1>)*abs(<1,-1,-1>))) = arccos(-1/3) ~~ 109.5^@#