bonjour;
triangle rectangle OAC rectangle en O
AC²=AO²+OC²
AC²=50²+100²
AC²+2500+10000
AC²=12500
AC=111
tangente α =OA/AC
tangente α =50/100
tangente α=0.5
0.5= tangente 26.5°
cosinus α =cosinus 26.5°
cosinus α =0.89
cosinus α= OC/AC
cosinus α=100/AC
0.89= 100/AC
AC= 100/0.89
AC= 112
