Question

Va rog ajutati-ma !

Answer 1

sinC = AB/BC

C = 30° = 1/2      } => 1/2 = 4/BC => BC = 2·4 = 8 cm

AC = √(BC² - AB²)  (Pitagora)

AC = √(64 - 16)

AC = √48 = 4√3 cm

• P = 4 + 8 + 4√3 = 12 + 4√3 = 4(3 + √3) cm
• A = AB·AC/2 = 4·4√3/2 = 8√3 cm²
• AD·BC = AB·AC => AD = AB·AC/BC = 16√3/8 = 2√3 cm