Surface Area of a Cuboid

Find the surface area of a cuboid with length $5$, width $3$, height $2$.

• 1Find the three face areas: lw = $5\times 3=15$, lh = $5\times 2=10$, wh = $3\times 2=6$
• 2Add them: $15+10+6=31$
• 3Double the total (each face has a matching opposite face): $2\times 31$

Answer: $62$

Find the surface area of a cuboid with length $10$, width $4$, height $6$.

• 1lw = $40$, lh = $60$, wh = $24$
• 2Add: $40+60+24=124$
• 3Double: $2\times 124$

Answer: $248$