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dit: d
jawab:
L= 22/7 x r^2
<=> 1,54 = 22/7 x r^2 (22/7 pindah ruas)
<=> 7 x 1,54/22 = r^2
<=> 0,49 = r^2 (akarkan kedua ruas)
<=> r = 0,7 dm
d=2r
d= 2 x 0,7 = 1,4 dm