As shown in the figure, fold one corner of triangle paper ABC, and the crease is EF. If ∠ a = 80 °, B = 68 ° and CFE = 78 °, calculate the degree of ∠ CEF

In ∵ △ ABC, a = 80 °, B = 68 °, C = 180-80-68 ° = 32 °, in ∵ △ AEF, C = 32 °, CFE = 78 °, CEF = 180-32-78 ° = 70 °

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