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jari-jari=30 cm or r=30
Dit:selisih keliling...?
Jwb:
2x3,14x45 2x3,14x30
282,6 188,4
seelisihnya 282,6 - 188,4 = 94,2
3,14 x 2 x 30 =188,4
282,6-188,4 =94,2