Chapitre 13 Triangles rectangles. Trigonométrie

ABC

[
BAC = 40
[
BAC
cos(
[
BAC) = = BA
BC
[
BAC
sin(
[
BAC) = = AC
BC
[
BAC
tan(
[
BAC) = = AC
AB

[BA]
BA ≈
[
ABC

α
tan(α) = sin(α)
cos(α)cos(α)2+ (sin(α)2= 1
x sin(x)=0,6