In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base
Since you have all three sides, just pick a trig function and evaluate its inverse.
sin x = 20/20.88
cos x = 6/20.88
tan x = 6/20
etc.
So, use arcsin, arccos, arctan, etc. to find x