Răspuns :
a+b+c+d=360°
a/6=b/8=c/4=d/0
a+b+c+d/6+8+4+6=360/24=15
a/6=15 a=6*15=90°
b/8=15 b=8*15=120
c/4=15 c=4*15=60
d/6=15 d=6*15=90
a=d=90°=>abcd trapez dreptunghic
a/6=k (constanta ) →a=6k
b/8=k→b=8k
c/4=k→c=4k
d/6=k→d=6k
6k+8k+4k+6k=360
24k=360
k=360:24
k=15
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a= 6k→a=6*15→a=90°
b= 8k→b=8*15→b=120°
c= 4k→c=4*15→c=60°
d= 6k→d= 6*15= 90 °
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ABCD = trapez dreptunghic