Find a missing box dimension
Work backwards from a surface-area total.
Try it
With width 3 cm, height 2 cm and total area 72 cm², write 72 = 2(3L + 2L + 6).
Check your reasoning
Solve L = 6 cm and substitute it back into the original expression.
Work backwards from a surface-area total.
With width 3 cm, height 2 cm and total area 72 cm², write 72 = 2(3L + 2L + 6).
Solve L = 6 cm and substitute it back into the original expression.