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b. 2.22/7.56 = 352
= 2 x 3,14 x 2.5 cm
= 157cm
b. K = 2 x phi x r
= 2 x 22/7 x 56 cm
= 352 cm
Itu phi nya beda-beda karena kalau jari"/ diameternya (angkanya) kelipatan 7 pake phi 22/7 kalau ga kelipatan 7 pake phi 3.14
Semoga bermanfaat ;)