what is the angle inside the elevatry side of a triangle which adjacent is 4cm,opposite 5cm and hypoteneuse 12cm
Your question does not make sense
First of all, sides of 4, 5, and 12 cannot form a triangle.
Secondly, the words adjacent, opposite and hypotenuse refer to sides of
a right-angled triangle, which yours is not.
Lastly, what is a "elevatry side" side?
Fix your post, then ask the question in a clear way.