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= 22/7 x (2 x 3,5)
= 22/7 x 7
= 154/7
= 22 cm
2.keliling= 3,14 x (2 x r)
= 3,14 x (2 x 5)
= 3,14 x 10
= 31,4 cm
kira kira kayak gitu jawabannya, sih. sorry bgt kalau salah :)