The lateral area is the area of the material is takes to make the cylinder (not including the bases). Since it was made from the 10x10 in square sheet of paper, the lateral area is 100 in^2.
The dimensions of the cylinder will be the 10 rolled into a circle which represents the circumference of the cylinder. C = pi*d
10 = 3.14*d
Divide both sides by 3.14
d = 3.18
Cylinder h= 10in, d=3.18in