Question

ajutor?? ofer coroana<3​

Answer 1

Răspuns:

Salut

a)AB²=BD²-AC²=1600-400=1200

AB=20√3

b)In dreptunghi diagonalele se injumatatesc,deci

AO=DO=20

∆AOD este ∆ echilateral AO=OD=AD=20

<DOA are 60°

c)A=AB•AD=20√3•20=40√3

1,73<√3<1,74 l•400

400•1,73<400√3<1,74•400

692<40√3<696<700

==evergreen==