e=40 cm
f=30 cm
h=24 cm
P=1/23f
P=1/2·30·40
P=600 cm²
P=ah
600=a·24
24a=600 |:24
a=25 cm
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e=40 cm
f=30 cm
h=24 cm
P=1/23f
P=1/2·30·40
P=600 cm²
P=ah
600=a·24
24a=600 |:24
a=25 cm