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Ex.4 si 5 va roooog

Ex4 Si 5 Va Roooog class=

Răspuns :

L=2pir
avem r1/r2= 2/3
L1/L2=2pir1/2pir2 = r1/r2=2/3

A=pir2 (patrat)
A1/A2=pir1 patrat/pir2 patrat= 2/3 la patrat=4/9