Answer:
C = 90 - d
Step-by-step explanation:
We know that the sum of complementary angles is 90 degrees
i.e.
Angle 1 + angle 2 = 90°
As it is stated in the question that one angle is d then
d+C = 90
where C is complementary angle of C
This can also be written as:
C = 90 - d ..