Question

REPEDE VAROOD DAU 5STELE​

Answer 1

Răspuns:

Explicație pas cu pas:

≈ triunghiuri ASEMENEA

ΔAOB≈ΔDOC ( CD║AB ) →DC/AB =DO/OB

12⁽⁶/30⁽⁶=(28-BO)/BO

2/5=(28-B0)/BO

2BO= 28*5-5BO

2BO+5BO = 140

7BO=140

BO= 140:7

BO= 20 cm

BO=AO=20cm

-

PΔ AOB= AB+AO +BO = 30+20+20=70 cm ( d)