Compute the surface area of the part of the cylinder x^2 + y^2 = 1, z>=0, between the planes y=0 and z=y+1

And one more!: Find the area of the triangle with vertices (1,2,0), (3,0,7), and (-1,0,0) using a surface integral. Check your answer using the cross product

I have no idea how to do these.