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ex 1 dau coroana
URGENTA MARE


Ex 1 Dau Coroana URGENTA MARE class=

Răspuns :

A baza =a²√3/4 unde a este latura Δ ⇒A baza=12√3/4
A lat=Pbaza*apotema /2⇒ A lat=6√3*3/2=9√3
A totala= A lat +A baza=9√3+3√3=12√3
succes !
Ab = l^2 rad 3 /4 = (2 rad 3)^2 rad 3 /4 = 4*3*rad3/4 = 3 rad 3 cm patrati 
Al = Pb*Ap/2 = 3l*Ap/2 = 3*2 rad3*3/2 = 9 rad 3 cm patrati 
At = Ab + Al = 3 rad 3 + 9 rad 3 = 12 rad 3 cm patrati