November 2018 2 59 Report
Sebuah lilin berbentuk tabung. jari jari alasnya 4cm dan tingginya 20cm (phi=3,14)
a. berapa volume lilin itu?
b. bila lilin dinyalakan dan setiap jam sebanyak 31,4cm^3 hbs terbakar. berapa lama lilin itu akan habis terbakar?

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