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S=1/2 * d1* *d2
S=1/2*8,2dm*11,3dm=46,33dm2
Równoległobok:
S= a*h
S=5,4cm*4,7cm=25,38cm2
Liczę na naj :)
P= 1/2 · 8,2 · 11,3 = 46,33dm2
P= a · h
P= 5,4 · 4,7 = 25,38 cm2