Question

RAPID!!!!!!!!!!!!!!!!!!!​
vreu doar raspunsurile

Answer 1

Răspuns:

Explicație pas cu pas:

i)x= 50° alterne interne

ii) y=50°+90°=140° unghi exterior

2)a)

i)AB=2r=6 cm

ii)(AB)=180°

iii)∡AOC=70°

iv) ∡BOC=180°-70°=110°

b)5/6=x/2 ⇒     x=5/3

Subiectul II

1) total bile 15+35=50

probabilitatea bilei albe=15/50=3/10

2)x/5=y/7=z/12(=(z-x)/(12-5)=49/7=7

x=35  ; y=49  ;z=12·7=84

3)

6 munc..............................8h

16 munc.............................x=6×8/16=3 h

4)

x+20+2x+3x-20=360     ⇒6x=360°        x=60°

∡AOB=60°+20=80°

∡BOC=120°

∡COA=3·60-20°=160°  

∡DOC=160°-120°=40°