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d₂=1,5 dm
1 dm=10 cm
d₂=1,5*10 cm=15 cm
h=7 1/17 cm=120/17 cm
P=½*d₁*d₂
P=½*8*15=60
P=a*h
60=a*120/17
a=60:120/17
a=60*17/120
a=17/2
a=8,5
Ob=4*a
Ob=4 * 8,5=34
a=60÷7 1/17=60×17/120=17/2=6½cm
ob=4×6½cm=26cm
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