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P=108cm^2
przekatne deltoidu x i y
wiadomo ze:
x/y=2/3
2y=3x
x=⅔y
wzor na P=½xy
108=½·⅔y·y
108=⅓y²
y²=108·3
y=√324=18 cm
to x=⅔·18=12cm
odp ; Przekątne deltoidu maja dlugosc 12cm i 18cm