4. [tex]SA_{sphere} = 4\pi r^2 = 4\pi*(3.2 cm)^2= 40.96\pi cm^2 \approx 128.679635 cm^2[/tex]

5. [tex]SA_{cube} = 6e^2 = 6*(15cm)^2 = 1350cm^2[/tex]

6. [tex]SA_{rectangular\,prism} = 2(lh + wh+lw)=2[(6cm)(4cm) +(3cm)(4cm)+(6cm)(3cm)] = 108cm^2[/tex]

7. [tex]SA_{cone} = \pi r^2 + \pi rh = \pi*(3cm)^2 + \pi * (3cm)*(7cm) = 30\pi cm^2 \approx 94.2477796 cm^2[/tex]

8. [tex]A_{circle} = \pi r^2 = \pi * (8cm)^2 = 64\pi cm^2 \approx 201.06193 cm^2[/tex]