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ex 3 dau coroana+multe puncteee

Ex 3 Dau Coroanamulte Puncteee class=

Răspuns :

∡4=∡8=∡6=∡3
∡1=∡7=∡2=∡5

∡4+∡5+∡2+∡8=360
fie ∡1=x  si  ∡4=5x
5x+5x+x+x=360
12x=360
x=30
∡1=30
∡4=150

b)∡5/2=∡8/3=k
∡5=2k
∡8=3k
∡5+∡8=180
2k+3k=180
5k=180
k=36
∡5=72
∡8=108