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8 cm
6.525cm, 41/ PI(3.14)= diameter/2= radius
25 cm /2 m = 25 cm/200 cm = 1/8
8 cm / 2 m = 8 cm / 200 cm = 8/200 and you can simplify that fraction if you wish.
It is: (2*6*8)+(2*8*12)+(2*6*12) = 432 square cm