a) P=5cm×10cm÷2
P=25cm²
b) P=12cm×5cm÷2
P=30cm²
c) P=6cm×5cm÷2
P=15cm²
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a) P=5cm×10cm÷2
P=25cm²
b) P=12cm×5cm÷2
P=30cm²
c) P=6cm×5cm÷2
P=15cm²