we will consider the log to be a cylinder with

r = 14/2 = 7cm radius of the base

h = 56cm height of the cylinder = the length of the log

Surface Area of a Cylinder = 2*pi*r ^2 + 2*pi*r*h

Surface Area of a Cylinder = 2*pi*(r^2 +r*h)

Surface Area of a Cylinder = 2pi (7^2 + 7*56)

Surface Area of a Cylinder = 882pi cm^2

Surface Area of a Cylinder = 2769.48 cm^2

the surface area of the log is 2769.48 cm^2.