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a=2x
b=3x
c=4x
d=√(2x)²+(3x)²+(4x)²=√29x²
√29x²=2√29
x√29=2√29
x=2
wymiary bryły:
a=2x=4
b=3x=6
c=4x=8
pole=2ab+2ac+2bc=
2×4×6+2×4×8+2×6×8=48+64+96=208j.²