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lingkaran 1 = 2 . π. 5 = 10π
lingkaran 2 = 2 . π . 15 = 30π
perbandingan lingkaran 1 dan 2 = 10π/30π=1 : 3.
Selisih kelilingnya 30π - 10π = 20π
k2 = 3,14 x 15 x 2 = 94,2
selisih = 94,2 - 31,4 = 62,8
perbandingan:
5 : 15
31,4 : 94,2
1 : 3