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706.50 = 3.14 x r^2
706.50 = r^2
3.14
225 = r^2
15 = r
30 = d
L= 706.5 cm2
π= 3.14
dit:
D
peny=
r2= 706.5 / 3,14
r2 = 22h
r =15
d= 2 x 15
d = 30 cm