raza = OB = 5 cm => BC = 2×OB = 2×5 cm = 10 cm
Aplicam Pitagora pentru ΔABC
AC² = BC² - AB²
AC² = 100 - 36
AC² = 64
AC = 8 cm
A(ΔABC) = AC×AB/2 = 8cm×6cm/2 = 24 cm²
A(cerc) = π×r² = π×OB² = 25×3, 14 = 78, 5 cm²
A(cerc) - A(ΔABC) = 78, 5 cm² - 24 cm² = 54, 5 cm²
