Réponse:

triangle abc

cos(acb)= adjacent/hypotenuse

cos(34) = 5cm/ ?

donc

5cm/cos(34)= ? ≈ 6 cm

triangle efd

sin(EDF)= opposé/hypotenuse

sin(65)= ?/8,8cm

donc

sin(65)*8,8cm=?≈7,9cm

triangle ghi

tan(hgi)= opposé/adjacent

tan(59)=?/4,2cm

tan(59)*4,2cm=? =6,9cm