Is it possible that any triangle has an angle of 0 degree? if not,then why do we calculate sin0 degree ??

If the angle between two sides of a triangle is 0 degree then they will saidto be collinear or concurrent.

And hence no triangle can be formed.

And sin0 = 0

in case of all the triangles!

in lower classes we were taught as such that the sin is p\h and so on but actually sinx as a function of x is defined as

x- x??^3\3?!???+ x^?5\5!..............    which is true for all values of x

Triangle of 0 degree doesn''t exists that y the value of sin0 is 0