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ditanya --> panjang diameter dan keliling lembaran logam
diameter =
=
keliling lembaran logam = π x diameter = π x 39,9 = 125,33 cm
a. diameter = r x 2 = 19,9 x 2 = 39,8
b. K = d x = 39,8 x 3,14 = 124,972 cm
karena 1.250 tidak bisa dibagi 3,14 ataupun 22/7 jadi aku ngambil 1 angka dibelakang koma tanpa pembulatan