Question

Problema 36 va rog cu formule de clasa a 9 a

Answer 1

A=60°->triunghi echilateral

r'=r

A=r+r'=>A=2r=>r=A/2=60°/2=30°

sini=nsinr=√3*1/2=√3/2=>i=arcsin√3/2=60°

δmin=2i-A=2*60°-60°=120°-60°=60°

n'sini=nsinr

raza patrunde ⊥AB=>i=0=>r=0.

Pe AC raza cade pe unghiul i=A=60°

nsinA=n'=>n'=√3*√3/2=3/2=1,5