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@sauravshakya
Do you have a diag ?

traversing through the surface

I mean on the surface

But how did u get angle between any two point is 109.5 degree

I got this question in the chemistry class

I also know it is 109.5 degree but how to calculate it geometrically.

I mean how to show the angle must be 109.5 degree

Alright let me work on it real quick.

i always wondered where that number 109.5... came from

I'm glad this could answer it! =D