Question

Sebah gabung tnpa tutup tinggi 16dm dan berdiamer 7dm .luas permukaan tabung tersebut adalah

Answer 1

LPTT=Πr(2t+r)
=22/7.3,5.(16*2+3,5)
=11.(32+3,5)
=11.35,5
= 390.5 dm²

Answer 2

L selimut + L alas = 2πrt + πr²
= (2×22/7×3.5×16) + (22/7×3.5²)
= (2×11×16) + (11×3.5)
= (22×16) + 38.5
= 352 + 38.5 = 390.5 dm² = 39.050 cm²