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23dm=230cm=2,3m
pole całkowite: Pc=½*5,6m*2,3m=2,8m*2,3m=6,44m²
Zad.2
druga przekątna: 24,6cm:3=8,2cm
pole: ½*24,6*8,2=12,3*8,2=100,86(cm²)
P tr = a×h÷2
a = 5,6 m = 56 dm
h = 23 dm
p = 23 dm x 56 dm ÷2 = 1288 dm ÷2 = 644 dm ²
zad 2
P rombu = e x f ÷ 2
e = 24,6 cm
f = 24,6 cm ÷3 = 8,2 cm
P = 24,6 cm x 8,2 cm ÷2= 201, 72 cm ÷2= 100, 86 cm²