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h=2a <=> a=1/2h
b=2h <=> h=1/2b
b=4a <=> a=1/4b
P=(a+b)h/2
P=?
a+4a+2a=14
7a=14
a=2cm
h=2×2
h=4cm
b=4×2
b=8cm
P=(2+8)4/2
P=20cm²