tolong dijawab ya.....

luas permukaan tabung = 2 phi r ( r + t)
= 2 phi r (r + 2r)
= 2 phi r (3r)
= 6 phi r^2

luas bola = 4 phi r^2 = 150

luas tabung = 6/4 x 150
 = 225

jawaban A