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P=14cm²
h=3,5cm
14cm²=a*3,5cm/:3,5cm
a=4cm-bok rombu
P=4a
O=4*4cm
O=16cm-obwód
h = 3,5 cm
P = a * h |:h
P : h = a
a = 14 : 3,5
a = 4 cm
Ob = 4 * 4 = 16 cm