Răspuns :

Ctinamaria31xxxid
a, b, c, d- unghiuri
a+b+c+d=360
a=11k
b=15k
c=21k
d=25k

11k+15k+21k+25k=360
72k=360
k=360:72
k=5

a=11*5
a=55 grade

b=15*5
b=75 grade

c=21*5
c=105 grade

d=25*5
d=125 grade
Miky93id
a,b,c,d  -ms. unghiurilor 

a,b,c,d,   dp cu 11,15,21,25

a/11= b/15=c/21=d/25=k
a=11k
b=15k
c=21k
d=25k

a+b+c+d=360 grade

11k+15k+21k+25k=360 grade

72k=360 grade

k=5 grade

a=55 grade 
b=75 grade
c=105 grade
d=125 grade