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obw.=114cm.
114cm.=x+ 2x
114=3x//3
114:3=x
38=x
x-bok działki
y-drugi bok działki
y=2x
Ob=114
Ob=x+x+y+y=2x+2x+2x=6x
114=6x
x=19
y=38
P=x*y=19*38=722cm^2
2.
d1=90cm
d2=120cm
h=72cm
P=d1*d2/2=90*120/2=5400cm^2
P=a*h
5400=72a
a=75cm