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e=30cm
f=8.75
P=30x8.75/2
P=15x8.75=131.25
a=30
h=8 3/4 = 8,75
P=30*8,75=262,5
w zaokrągleniu będzie 263.
odp. pole rombu wynosi 262,5 (j)
d1 = 30cm
d2 = 8 3/4
P = 130,125~ 130,125