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P=1/2ah
P=126cm²
a=13cm
126=1/2*13h
126=6,5h/:6,5
h=19,(384615)cm
a=20cm
126=1/2*20h
126=10h/:10
h=12,6cm
a=21cm
126=1/2*21h
126=10,5h/:10,5
h=12cm---najkrótsza wysokość