Answer:
CFD and DFE are complementary
Step-by-step explanation:
Complementary angles add to 90
We know that CFE equals 90 degree
CFE + CFB = 180 because they form a straight line
CFB is a right angle = 90
CFE +90 = 180
Subtract 90 from each side
CFE =90
CFE is made up of two angles, CFD and DFE
There fore CFD and DFE are complementary
