Answer:
✏️SURFACE AREA
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WRITTEN WORKS
» Find the surface area of each solid figure.
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#1: A cylinder whose radius is 7 m and whose height is 12 m.
\begin{gathered} \begin{aligned} & \bold{Formula:} \\ & \boxed{SA = 2\pi r^2 + 2\pi rh} \end{aligned} \end{gathered}
Formula:
SA=2πr
2
+2πrh
SA = 2(3.14)(7\,m)^2 + 2(3.14)(7\,m)(12\,m)SA=2(3.14)(7m)
2
+2(3.14)(7m)(12m)
SA = 2(3.14)(49\,m^2) + 2(3.14)(7\,m)(12\,m)SA=2(3.14)(49m
2
)+2(3.14)(7m)(12m)
SA = 307.72\,m^2 + 527.52\,m^2SA=307.72m
2
+527.52m
2
SA = 835.24\,m^2SA=835.24m
2
\therefore∴ The surface area of the given cylinder is about...
\large \underline{\boxed{\tt \purple{835.24\,m^2}}}
835.24m
2
\: \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad
#2: A cube whose edge is 5 cm.
\begin{gathered} \begin{aligned} & \bold{Formula:} \\ & \boxed{SA = 6s^2} \end{aligned} \end{gathered}
Formula:
SA=6s
2
SA = 6(5\,cm)^2SA=6(5cm)
2
SA = 6(25\,cm^2)SA=6(25cm
2
)
SA = 150\,cm^2SA=150cm
2
\therefore∴ The surface area of the given cube is...
\large \underline{\boxed{\tt \purple{150\,cm^2}}}
150cm
2
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