Question

What is the complement of 51 degrees

Answer 1

Find the supplement of the complement of a 51 degree angle. 
:
51 = the angle
The complement, then is:

(90-51) = 39 
:
The supplement:
180 - 39 = 141; is the solution

Answer 2

Complementary  has sum = 90
so
90-51 = 39

answer 
39 is the complement of 51 degrees