16Hit1600
Geometry and TrigonometryHardSurface area of a square-based box

Geometry and Trigonometry practice question

A closed box has a square base with side 5 and a height of 2. What is its total surface area?

Answer: 90

Two square faces of 25 each and four rectangular faces of 10 each: 50 + 40 = 90.

Common wrong answers

If you answered 50
50 is the volume.
If you answered 65
65 counts only one square face.
If you answered 70
70 counts the rectangular faces twice but the squares once.

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