Question

Bantuin ya.. bingung nih (bangun ruang sisi lengkung)

Answer 1

Luas alas tabung*= luas lingkaran
154. = πr^2
= 22/7 r^2
r^2. = 154 × 7/22
= 49
r. =√49=7

Luas perm tabung adl
=2πr(r+t)
=2.22/7.7(7+13)
=44×20
=880
jadi Luas perm tabung adl 880