**TI82** TxtView file generated by CalcText - Kouri¨™CH10MATH™—ÿ10)Produit scalairevec(AB)*vec(AC)=AB*AC*cos ABC vec(AB)*vec(AC)=0 <=> (AB)Perpendiculaire a (AC) vec(u)*vec(u')=xx'+yy'+zz' vecu²=x²+y²+z² Norme vec U=R²(x²+y²+z²) 1)Les plans A(xa,ya,za) et vecu(a,b,c) a(x-xA)+b(y-yb)+c(z-za)=0 <=> M appartien a P (P):ax+by+cz+d=0 d(A;P)=|axa+bya+cza+d|/R²(a²+b²+c²) (Point/plan) AH=|axa+bya+cza|/ R²(a²+b²) (Point/droite) ÿ-|