i.8.14 Surface integrals

(3.) \( \frac{\text { }}{\text { }} \) Condition: Find the area of ​​the part of the surface \( L \) cut out by the surface \( H \). \[ L: x^{2}+y^{2}=2 a z, \quad H:\left(x^{2}+y^{2}\right)^{2}=2 a^{2} x y . \]