Jawabanmu

2014-09-02T21:03:07+07:00
Luas permukaan kerucut = πr(r+s)
3696 = 22/7*21(21+s)
3696 = 66(21+s)
3696/66 = 21+s
56 = 21+s
s = 56-21
s= 35 cm

tinggi kerucut kuadrat = 35²-21²
= 28 cm