CASE STUDY QUESTION
Three book shelves AB, CD and EF, made up of wooden boards are fitted on the wall horizontal to the floor as shown in the figure .To give stability and a

good look the two shelves AB and CD were joined by a wooden plank BE. Similarly CD and EF were joined by CE. The entire arrangement as such that the angles measured as follows.
∠ABE= 660, ∠BEC=360
Based on the above information and the given figure answer the following questions.
(a) What is the measure of ∠BEF?
(b) What is the relation between AB and EF?
(c) What is the measure of ∠CEF?
(d) What is the measure of ∠DCE?
(e) What is the between the angles ∠ABE and ∠BEF?