Jawabanmu

2014-09-05T19:01:25+07:00
Lp = 2×phi×r (r+t)
4396 = 2×3,14×15(15+t)
225 + 15t = 4396 ÷ 3,14 ÷ 2
15t = 700 - 225
15t = 475
T = 31,6