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romb:
d1=8cm
d2=x
trójkąt:
h=6cm
a=x+1
P rombu = 1/2 * d1 * d2 = 1/2 * 8 * x = 4x
P trójkąta = 1/2 * a * h = 1/2 * (x+1) * 6 = 3x +3
4x > 3x + 3
x > 3
Odp. Druga przekątna rombu musi być większa od 3.