Find angle, given lengths of two sides of right triangle

[jeffg130]

ok so there is a triangle ABC B is 90 degrees plz find Angle ACB
A#
#---#
#-------#
#---------- #
#-------------#
#----------------# 20 units
#------------------#
#---------------------#
#-----------------------#
#-------------------------#
#---------------------------#
#-90--------------------------#
B##################C
-------------6units---------------------

 

[Deleted member 4993]

You already know the angle ABC = 90°

perhaps you want to find the measure of the angle ACB.

Cosine(ACB) = BC/AC = ?

Now can you use your calculator to find the measure of the angle? (be careful about conversion from radian to degrees and vice-versa)