B. Lp = Luas selimut kerucut + Luas selimut tabung + Luas selimut kerucut
Lp = 2 × L selimut kerucut + L selimut tabung
Lp = 2 × πrs + 2πrt
Lp = 2πr (s + t)
Lp = 2πr (√(r² + t²) + t)
Luas permukaan bangun b adalah 2πr (√(r² + t²) + t)
V = V kerucut + V tabung + V kerucut
V = 2 × V kerucut + V tabung
V = 2 × 1/3 πr²t + πr²t
V = πr²t (2/3 + 1)