Question

urgent am nevoie va rog​

Answer 1

Răspuns:

Explicație pas cu pas:

BD/CD=9/16  ;   ⇒BD=9k  ;  CD=16k

⇒BC=9k+16k =25k

AB²=BD*BC=9k+16k=225k²

AB=√225k² =15k

AC²=CD*BC=16k+25k =400k²

AC=√400k²=20k

P=AB+AC+BC=15k+20k+25k=60k

180 =60k

k=180/60 =3⇒

BC=25k=25*3 =75 cm

AB =15*3 =45 cm

AC=20*3 =60 cm

b)  BD=9k=9*3 =27 cm

CD=16k=16*3=48cm

AD²=BD*CD=27*48=1296

AD=√1296=36cm

Aabc =BC*AD/2 =75*36/2 =1350 cm²