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2014-09-24T16:37:50+03:00
L=2/3 * L
P=2*L+2*l=2L+2*2/3*L=(3*2L+4L)/3=10/3*L
P=390        deci, 10/3*L=390  L=390*3/10=117 m  si l=2/3*117=78 m
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