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Problema 21, vă rog!​

Problema 21 Vă Rog class=

Răspuns :

Răspuns:

AB/BC=3/4

AC=10cm diagonala

AC²=AB²+BC²=(3BC/4)²+¹⁶BC²

AC²=(9BC²+16BC²)/16=25BC²/16

16×100/25=BC²

BC=40/5=8cm

AB=3BC/4=3×8/4=6cm

Perimetru=8×2+6×2=16+12=28cm