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z wlasnosci kata ostrego 45stopni wynika zaleznosc:
h√2=a
3√2 cm=a --->dlugosc boku rombu
czyli pole rombu wynosi:
P=a·h=3√2·3=9√2 [cm²]
sin 45 stopni = h/a
√2/2=3/a
√2a=6
a= 6√2/2
a=3√2
P=a*h = 3√2 *3 = 9√2