Question

URGENT!VA ROG DAU 30 DE PUNCTE​

Answer 1

Răspuns:

Explicație pas cu pas:

a)in ΔABD   este dreptunghic in A

AB²+AD²=BD²        BD=10 m

AO=AB·AD/BD=6·8/10=4,8 m

AB²=BO·BD      36=BO·BD      BO=3,6 m

OC²=CB²-BO²=6,6²-3,6²=3·10,2=30,6     OC=√30,6≅5,53

AC=AO+OC=4,8+5,53=10,33 m

b)Aabcd=Aabd+Abcd=AB·AD/2+OC·BC/2=6·8/2+5,53·10/2=

=24 m²+27,65 m²=51,65 m²

c)Aaod=AO·OD/2=

OD=BD-BO=10m-3,6m=6,4m

Aaod=8,4·4,8/2=4,2·4,8=20,16 m²

Aboc=BO·OC/2=3,6·5,53/2=1,8·5,53=9,954 m²

Aboc/Aaod=9,954/20,16≅0,494   ⇒49,4%