Răspuns:
Explicație pas cu pas:
a)
a/5=b/7=c/8=d/10=(a+b+c+d)/(5+7+8+10)=360°/30=12°
a=5·12°=60°
b=7·12°=84°
c=8·12°=96°
d=10·12°=120°
b) a/1/2=b/1/3=c/1/4=d/1/6=(a+b+c+d)/(1/2+1/3+1/4+1/6)=
=(360°/(6+4+3+2)/12=360°·12/15=24°·12=288°
a=288°/2=144°
b=288/3=96°
c=288°/4=72°
d=288°/6=48°