bonjour,
22)
triangle BAC
angles(BAC+ACB+ABC)=180°
angles(BAC +ACB)=48+59=107°
107°+angle(ABC)=180
angle BAC=180-107
angle BAC=73°
23)
angle(EBC)=180°
angle EBC)=angles(EBA+BAC)
180°=115°+angle ABC
180+115=angle BAC
65°=angle BAC
angle BCD=180°
angle BCD=angles(BCA+ACD)
180°=angle BCA+118
180-118=angle BCA
62°=angle BCA
triangle BAC
angles(BAC+BCA+ABC)=180°
angle BAC+62+65=180
angle BAC+127=180
angle BAC=180-127
angle BAC=53°
25)
triangle PTS
angles(PTS+PST+SPT)=180°
30+angle PST+110=180
angle PST=180-140
angle PST=40°
R P S alignés
angle PST=angle RST=40°
angle SPR=180°
angle SPR=angles(SPT+TPR)
180=110+angle TPR
angle TPR=180-110
angle TPR=70°
triangle TRP
angles(RTP+TRP+TPR)=180
45+angle(TRP)+70=180
angle TRP=180-115
angle TRP=65°
R P S alignés
angle TRP=angle TRS=65°
