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Sagot :

Bonsoir,

1) Théorème de Pythagore : DF² = 34² - 16² = 900

  donc : DF = √900 = 30 cm

2) cos angle DEF = DE/EF = 16/34 = 8/17

   sin angle DEF = DF/EF = 30/34 = 15/17

   tan angle DEF = DF/DE = 30/16 = 15/8

3) cos angle DFE = DF/EF = 30/34 = 15/17

   tan angle DFE = DE/DF = 16/34 = 8/17

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