Răspuns:
6. A VEF = 4 radical 3 cm^2
A VEF = L^2 radical 3 / 4
4 radical 3 = L^2 radical 3 / 4 / : radical 3
L^2 /4 = 4
L^2 = 4 × 4
L = radical 16
L = 4 cm
EF = 4cm =》EO + OF ( VEO = CON CIRCULAR DREPT =》VO va cadea in centrul bazezi )
EO + OF = 4
EO = EF = raza = 4:2 =2 cm
A bazei = pi × r^2 = 2^2 × pi = 4 pi
b)A VEF = L^2 radical 3 / 4
A VEF =6 radical 3 cm^2
L^2 radical 3 / 4 = 6 radical 3 / : radical 3
L^2 /4 = 6
L^2 = 6 × 4 =24
L = radical 24 = 2 radical 6
EF = 2 radical 6
Ef = EO + OF = raza × 2
OF = 2 radical 6 :2
OF = 1 radical 6
raza = OF
A bazei = pi × raza^2
= pi × 1 radical 6 ^2
= pi × 6
