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Tak więc 8:2=4
Obwód = 4x4 = 16dm
P=8*15/2=120/2=60
P=a*h
60=a*7 i jedna siedemnasta |:7 i jedna siedemnasta
a=17/2
a=8½
L=4a
L=34cm
Pole Równoległoboku=a*h
h=7¹/₁₇
d₁*d₂*½ =a*h
8*15*½=a*7¹/₁₇
60=7¹/₁₇a............................................../ : 7 ¹/₁₇
a=8,5 - jeden bok rombu
Ob=4*8,5=34 cm