177#
D
A
C
4 cm
45°
30°
Diagram not drawn to scale
Length AB=4cm
Length DB is shared between both triangles
Angle ABD=45
Angle DBC=30
Triangle ABD and triangle DBC are right angle triangles
Calculate the length of BC.
Give your answer in surd form.
Do not use your calculator to answer this question.
(7 marks)