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B) 4*12/2 = 24dm²
C) 25*4/2 = 50cm²
a) 0.03m=3 cm
12cm
P=3*12/2
P=18cm²
b)4dm=40cm
1,2m=120cm
P=40*120/2
P=2400cm²
c)1/4m=25cm
0.4dm=4cm
P=25*4/2
P=50cm²
a) 0,03m = 3 cm
P = ½ × 3cm × 12cm
P = 16cm²
b) 1,2m = 12dm
P = ½ × 4dm × 12dm
P = 24dm²
c) ¼m = 0,25m = 2,5dm
P = ½ × 2,5dm × 0,4dm
P = 0,5dm²