tolong bantu ini masih pusinng.

2. L = 2πr(r+t) = 2.(22/7).7.(7+16) = 44.23 = 1013 cm"
3. V = πr"t = 22/7 . (7/2) . (7/2) . 20 = 22.35 = 770 cm'''

2) luas permukaan tabung = 2 x π x r ( r + t )
= 2 x 22/7 x 7 ( 7 + 16 )
= 44 ( 23 )
= 1012 cm²
3) volume = luas alas x tinggi
= π x r² x tinggi
= 22/7 x 3,5 x 3,5 x 20
= 22/7 x 3,5 x 35 x 2
= 22 x 35
= 770 cm³