teguh088
31. R = 2r, T = 2t V mula2= 1/3πr²t V akhir = 1/3πR²T = 1/3π(2r)²(2t) = 1/3π.4r².2t = 8. 1/3πr²t alias 8 kali volume mula2. Jadi 8 x 880 = 7.040 cm³ (D)
32.Luas bola = 154 cm² = 4πr² r² = 12,25 cm² r = 3,5 cm
r tabung = r bola = 3,5 cm Tinggi tabung = 4 x r bola = 14 cm
Luas permukaan tabung L = 2πr² + 2πrt L = 2πr(r+t) L = 2.22/7.3,5(3,5+14) L = 385 cm²
V mula2= 1/3πr²t
V akhir = 1/3πR²T = 1/3π(2r)²(2t) = 1/3π.4r².2t = 8. 1/3πr²t
alias 8 kali volume mula2.
Jadi 8 x 880 = 7.040 cm³ (D)
32.Luas bola = 154 cm² = 4πr²
r² = 12,25 cm²
r = 3,5 cm
r tabung = r bola = 3,5 cm
Tinggi tabung = 4 x r bola = 14 cm
Luas permukaan tabung
L = 2πr² + 2πrt
L = 2πr(r+t)
L = 2.22/7.3,5(3,5+14)
L = 385 cm²