Question 733694
Note that we do not need the 6mm measurement for surface area calculations!

Surface Area (SA) of cylinder (two ends are circles) formula is

SA = 2*pi*radius squared + 2*pi*radius*height
SA = 2*22/7*4 squared + 2*22/7*4*10, therefore SA = 100.6 + 251.4 = 352 square mm's

Surface area of cone (one end is a circle) formula is

SA = pi*radius squared + pi * radius * hypotenuse (s)
first calculate s squared = radius squared + height squared, 
                s squared = 10 squared + 25 squared = 100+625=725
                s = square root of 725 = 26.9 mm
SA = 22/7*10 squared + 22/7*10*26.9 = 2200/7 + 22/7*10*26.9=314.3+825.4=1159.7 square mm's

Surface area of rectangular solid is

the square base is 40mm by 40mm = 1600 square mm and there are two ends so total for 2 square ends is 3200 square mm

now there are 4 sides that are 50 by 40 or 2000 square mm * 4 = 8000 square mm

adding the two calculations

SA = 3200 + 8000 = 11200 square mm's