Incorrect.
1 m = 100 cm
1 m2 = (100 cm)2 = 10000 cm2
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A cube with side of length 1 cm is the same as a cube with sides of length 10 mm (as there are 10 mm in 1 cm). So the the area of one face of this cube would be 10 mm x 10 mm which equals 100 mm squared. There are 6 faces to the cube so 6 x 100 mm squared = 600 mm squared.
100 cm(2). (2) means squared
Since area equals Pi times radius squared take and substitute what is known. 345 equals Pi times the radius squared. divide Pi into both sides for 109.8 equals the radius squared. Now take the square root of 109.8 to get an r of 10.47936 cm.
5*5*4 = about 100 cm3
1 m = 100 cm so 8 m = 800 cm. Simple!