Jawapan

2015-08-23T22:42:37+08:00
Luas permukaan silinder = 2 \pi  j^{2} + 2 \pi j t

Luas permukaan = 170  \pi cm
Jejari = 5 cm

2 \pi (5^{2}) + 2 \pi (5) t = 170 \pi
2 \pi (25) + 10 \pi t = 170 \pi
50 \pi + 10 \pi t = 170 \pi
10 \pi t = 170 \pi - 50 \pi
10 \pi t = 120 \pi
t = 120 \pi  / 10 \pi
t = 12 cm