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25)

*ABCDEF*is a triangular prism which represents part of a hill.

*ABCF*is the horizontal rectangular base.*D*is vertically above*C*.

a) Work out the height

*CD*.**[2 marks]**

b) Jamil walks in a straight line from

*A*to

*D*.

Work out the size of angle

You

*DAC*.You

**must**show your working.**[4 marks]**