keliling alas sebuah tabung 88 cm jika tinggi tabung 30 cm tentukan volumenya

v = phi × r × r × t
= 22/7 × 14 × 14 × 30
= 22 × 2 × 14 × 30
= 44 × 14 × 30
= 18480

K = 2pi x r
88= (2x 22/7) x r
88= 44/7 x r
88: 44/7 = r
14 =r
L= pi x r x r x t
=22/7 x 14 x 14 x 30
=616 x 30
=18480cm3