Geometry and TrigonometryHardSurface area of a rectangular box
Geometry and Trigonometry practice question
A closed rectangular box measures 4 cm by 5 cm by 6 cm. What is its total surface area, in square centimetres?
Answer: 148
2(4×5 + 5×6 + 4×6) = 2(20 + 30 + 24) = 148.
Common wrong answers
- If you answered 60
- 60 doubles only two of the three pairs of faces.
- If you answered 74
- 74 counts each face once instead of twice.
- If you answered 120
- 120 is the volume.
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