Jawaban:

Bangun 1 :

Vol. Balok = P × L × T

• 9 × 11 × 4

• 396

Vol. Tabung = pi × r² × t

• r = 7 ÷ 2 = 3,5²

• 22/7 × 3,5 × 3,5 × 2

• 3,5 × 2 = 7 ÷ 7 = 1

• 22 × 3,5 = 77 cm

Vol. Bola = 4/3 × pi × r³

• 4/3 × 22/7 × 42,875 (3,5³)

• 42,875 × 4 = 171,5

• 171,5 ÷ 7 = 24,5

• 24,5 ÷ 3 = 8,16

• 8,16 × 22 = 179,52 cm

Luas Perm. Kerucut = (pi × r) × (s + r)

• s =

• 21² + 28²

• 441 + 784 = 1225 (35²)

• (22/7 × 28) × (35 + 28)

• 28 ÷ 7 = 4

• (4 × 22 = 88)

• 35 + 28 = 63

• 88 × 63 = 5544 cm

Luas Perm. Bola :

• 4 × pi × r²

• 4 × 22/7 × 784

• 784 ÷ 7

• 112 × 4 × 22 = 9.856 cm