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18)

The points

*A*,

*B*,

*C*and

*D*lie on a circle.

*DE*is a straight line.

*BA*=

*BD*

*CB*=

*CD*

Angle

*ABD*= 40°

Work out the size of angle

*ADE*.

You must give a reason for each stage of your working.

**[5 marks]**