Jawabanmu

2014-03-02T15:44:55+07:00
Luas karton 4 ( phi*r^2)
= 4 * 22/7 * 7 *7
= 616
Apa gak keliru tuh ? mungkin begini mbak : luas = 1/4 * 22/7 * (3,5 cm)^2
= 9,625 cm^2
2014-03-02T15:47:33+07:00