5.
b)
Pp = 5cm × 5cm = 25cm²
2Pp = 50cm²
Pb = (5cm × 8cm) × 4 = 40cm² × 4 = 160cm²
Pc = 160cm² + 50cm² = 210cm²
V = 25cm² × 8cm = 200cm³
6.
b)
Pp = 6 × [tex]\frac{36\sqrt{3} }{4}[/tex] = 6×9√3 = 54√3cm²
2Pp = 2 × 54√3cm² = 108√3cm²
Pb = (6cm × 10cm) × 6 = 360cm²
Pc = 360cm² + 108√3cm² = (360 + 108√3)cm²
V = 54√3cm² × 10cm = 540√3cm³
