a. Sphere. V = (4/3)πr³ [π≈3.14; r=6]
V = (4/3) * 3.14 * 6³ ≈ 904.3 m³
b. Сone. V = (1/3)πr²h [π≈3.14; r=5]
By the Pythagorean theorem:
h = √(13²-5²) = √144 = 12 m
V = (1/3) * 3.14 * 5² * 12 ≈ 314 m³
c. Rectangular parallelepiped. V = lwh [l=11, w=5, h=6]
V = 11 * 5 * 6 = 330 cm³
