SA = 34.56 mm2
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Side = 6 mm Area = 216 mm2 Volume = 216 mm3 Area/Volume = 1 per mm
35,680mm2
British penny: 324 mm^2 American penny: 285 mm^2
If each side of the cube is 42.6 mm long, then the cube's volume is 77.31 cm3
Not clear which area you want. The surface area of the cylinder can only be determined if you give the length of the cylinder as well as its diameter. As you don't give this I conclude you want the area of the ends only. Each end will be the difference between the area of the 100 mm circle and the 30 mm circle. 100 mm diameter area = 7855 sq mm. 30 mm diameter area = 707 sq mm. Therefore area of end = 7148 sq mm, and you have two ends so total = 14296 sq mm