Z.1
20dm:4 = 5dm
5dm:2 = 2.5dm
P= 1/2*5dm*2.5dm = 6.25dm^(2)
Z.2
5cm*2 = 10cm
P= 1/2*(10cm+16cm)*4cm = 12cm*4cm = 48cm^(2)
Z.3
23cm-7cm-7cm = 9cm
9cm:2 = 4.5cm
P= 9cm*4.5 = 40.5cm^(2)
^(2)-do kwadrat (tak jeśli by ktoś nie wiedział C:)
