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P=e*f/2
e,f--przekątne
P=5*4,8=24cm²
6f/2=24
6f=48/:6
f=8cm druga przekatna ma 8cm
a=5cm
h=4,8cm
e=6cm
f=?
P=5×4,8
P=24 [cm²]
2P=ef
f=(2P)÷e
f=(2×24)÷6
f=8 [cm]