September 2018 2 49 Report
Panjang jari - jari alas sebuah kerucut 10 cm, dan luas selimutnya 628 cm². Jika jari - jari = 3,14 , Maka panjang garis pelukis kerucut tersebut adalah .....

a. 5 cm
b. 10 cm
c. 15 cm
d. 20 cm
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