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a=⁴/√₃
a=4 *√3/√3 *√3=4√3/3
2a= 2*4√3/3=8√3/3
odp. Długość tego rombu wynosi 8√3/3
2a= 4| :2
a=2
a√3=2√3
obw= 2+2+2√3+2+4=10+2√3