Question

Perhatikan gambar berikut! 21 cm 30 cm 42 cm Tentukan volume bangun tersebut! Jawab:​

Answer 1

V 1/2 bola = 1/2 x 4/3 x π x r³

= 1/2 x 4/3 x 22/7 x 21 x 21 x 21

= 4 x 11 x 21 x 21

= 19.404 cm³

V tabung = luas alas x tinggi

= π x r² x t

= 22/7 x 21 x 21 x 21

= 22 x 3 x 21 x 21

= 29.106 cm³

V kerucut = 1/3 x luas alas x tinggi

= 1/3 x π x r² x t

= 1/3 x 22/7 x 21 x 21 x 30

= 22 x 3 x 21 x 10

= 13.860 cm³

V gabungan = V 1/2 bola + V tabung + V kerucut

= 19.404 + 29.106 + 13.860

= 62.370 cm³