Jawabanmu

2014-03-18T16:13:03+07:00
R = 21 , caranya 1386:22/7 = r², 441= r², r = 21 keliling = 2Πr 2x22/7x21 = 132
132 : 4 = 33
1.386 : 22 = 63 X 7 = 441 di akarkan menjadi 21 D = 21 + 21 = 42
KL : 22/7 X 42 = 22 X 6 = 132 M
Banyak Pohon Cemara = 132 M : 4 M = 33 Pohon Cemara