Question

8. Which of the following is a set of complementary angles? * A./CFD and /EFD B./AFD and /DFE C./AFC and /DFC D./BFC and /DFE​

Answer 1

D. ∠BFC and ∠DFE

∠DFE = 30°

To find ∠BFC , subtract ∠AFC and ∠AFB —

100° - 40° = 60°

∠BFC = 60°



60° + 30° = 90° ,
Therefore ∠BFC and ∠DFE are complementary.