Răspuns:
{a,b,c,d} d.p. {1, 2, 3, 4}=>
[tex] = > \frac{a}{1} = \frac{b}{2} = \frac{c}{3} = \frac{d}{4} = k[/tex]
a+b+c+d=360°=> 1k+2k+3k+4k=360°
10k=360°=> k=36°
a=36°
b=2×36=72°
c=3×36=108
d=4×36= 134°
