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∆ ABC AB= AC=18 cm ; BC=20 cm
m(^B)=75°
Aflati : a) m (^A) ; m ( ^C)
b) P ∆ ABC
(FARA DESEN EXACT)


Răspuns :

a )triunghiul BAC isoscel =>(^B )=(^C )=>(^C)=75=>(^A)=180-75-75=30
b) P=AB+BC+AC=18+18+20=56