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Pabcd=4*7
Pabcd=28 j²
Pdec= 1/2*a*h
a=7cm
h= 1/2*4j
h=2j
Pdec=1/2*7*2
Pdec=7 j²
Paed=1/2*a*h
a=4j
h=1/2*7j
h=3,5j
Paed=1/2*4*3,5
Paed=7 j²
dec=(7*2):2=7
aed=(4*3,5):2=7