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​Q25: Question – Paper 3– June 2017
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25) ​
​Rectangle ABCD is the horizontal base of a triangular prism ABCDEF.
AE = BE
E is vertically above M, the midpoint of AB.
AB = 16 cm     AE = 17 cm     BC = 30 cm
a) Show that EM = 15 cm
[2 marks]

​b) Work out the size of angle ECM.
[4 marks]