Geometry Puzzle – Critical Thinking 17

If you are a math teacher, you can move beyond the norm in your math classroom and challenge students to think critically by this kind of critical thinking challenges!

Geometry Puzzle – Critical Thinking 17

Challenge:

The volume of a cube is one third of the total surface area of the cube. What is the sum of all edges of the cube?

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The correct answer is 24.

A cube has 12 edges. The formula for the volume and surface area of a cube are:
V = S\(^3\)             SA = 6S\(^2\)
The volume of a cube is one-third of the total surface area of the cube. Thus:
S\(^3=  \frac{1}{3}\)6S\(^2\)
Remove S\(^2\) from both sides and solve for S.
S = \(\frac{1}{3}\)6 = 2
One side of the cube is 2. The sum of all edges is
2 × 12 = 24

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Math and Critical Thinking Challenges: For the Middle and High School Student