(18cm+11cm)*5,4cm/2 = 29*5,4/2 cm^2 = 156,2/2 cm^2 = 78,3
P = (a+b) * h /2
P = (18+11) * 5,4 /2
P = 29 * 5,4/2 = 156,6 /2
P = 78,3
Do końca nie jestem pewna, ale powinno być spoko.
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(18cm+11cm)*5,4cm/2 = 29*5,4/2 cm^2 = 156,2/2 cm^2 = 78,3
P = (a+b) * h /2
P = (18+11) * 5,4 /2
P = 29 * 5,4/2 = 156,6 /2
P = 78,3
Do końca nie jestem pewna, ale powinno być spoko.