### Find the area of the surfaces.

1.)The part of the hyperbolic paraboloid z= y^2 - x^2 that lies between the cylinders x^2 + y^2 = 1 and x^2 + y^2 = 4 2.)The part of the sphere x^2 + y^2 + z^2 = a^2 that lies within the cylinder x^2 + y^2 = ax and above the xy-plane