Answer:
[tex]360^{o}[/tex]
Step-by-step explanation:
From the figure, one can see that the addition of the internal angles of the parallelogram are exactly the same as the addition of the internal angles of the two triangles. Since the sum of the internal angles of ANY triangle give [tex]180^o[/tex], then the addition of two of them will render [tex]360^o[/tex].
And from the figure, this addition happens to match exactly the addition of internal angles of the parallelogram.
