1) elevii unei clase au schimbat intre ei fotografii , astfel ca fiecare elev a primit cate o fotografie de la toti colegii sai. aratati ca numarul de fotografii este par. creterii de divibilitate cu 2,5 si 10^n 2) fie numerele 42,688,32,15,126,1114,71,3012,455,1 25,112,60,14,751,10,20,45,300,126,5 00,520,1700,430. scrieti numerele care sunt divizibile cu . a)2 b)5 c)10 3) care este cel mai mare numar natural de patru cifre diferite divizibile cu 2? dar cu 5? dar cu 2 si 5 ? urgent

3/6   and 9/18

step-by-step explanation:

∠1≅∠2 by the alternate exterior angles theorem.

step-by-step explanation:

given, a ∥ b and ∠1 ≅ ∠3 .we have to prove that e ∥ f

we know that ∠1≅∠3 and that a || b because they are given. we see that by the alternate exterior angles theorem. therefore, ∠2≅∠3 by the transitive property. so, we can conclude that e || f by the converse alternate exterior angles theorem.

we have to fill the missing statement.

transitivity property states that if a = b and b = c, then a = c.

now, given ∠1≅∠3 and by transitivity property ∠2≅∠3 .

hence, to apply transitivity property one angle must be common which is not in result after applying this property which is ∠1.

the only options in which ∠1 is present are ∠1 and ∠2, ∠1 and ∠4

∠1 and ∠4 is not possible ∵ after applying transitivity we didn't get ∠4.

hence, the missing statement is ∠1≅∠2.

so, ∠1≅∠2 by the alternate exterior angles theorem.