Odpowiedzi

2009-05-14T18:58:28+02:00
A²=(1/2a)²+[(2/3√3)/2]²
a²=1/4a²+(4/9*3)/4
3/4a²=1/3 /*4/3
a²=4/9
a=2/3

obw =3*2/3=2
2009-05-14T22:21:09+02:00
A²=(1/2a)²+[(2/3√3)/2]²
a²=1/4a²+(4/9×3)/4
3/4a²=1/3 /×4/3
a²=4/9
a=∫4/9
a=2/3

Ob=3a
Ob=3×2/3
Ob=2cm.