Bonsoir
triangle rectangle RUS :
Cos 19° = US/SR
SR = US/Cos 19°
SR = 6/Cos 19°
SR ~ 6,35 cm
triangle rectangle TWS :
Sin 44° = TW/TS
Sin 44° = 4,4/TS
TS = 4,4/sin 44°
TS ~ 6,33 cm
triangle rectangle VTR :
Tan 44° = TW/SW
Tan 44° = 4,4/SW
SW = 4,4/tan 44°
SW ~ 4,56 cm = VU
VT = 6 - 4,4 = 1,6 cm
Tan 19° = RU/SU
RU = SU x tan 19°
RU = 6 x tan 19°
RU ~ 2,07 cm
VR = 4,56 - 2,07 = 2,49 cm
RT^2 = VT^2 + VR^2
RT^2 = 1,6^2 + 2,49^2
RT^2 = 2,56 + 6,2
RT^2 = 8,76
RT ~ 2,96 cm
RT # ST # SR donc le triangle n’est pas isocèle
