Net of a cube

This net can be folded to form a cube with a side length of 20 units. What is the surface area of the cube in square units?

Correct result:

S =  2400


a=20 S=6 a2=6 202=2400a=20 \ \\ S=6 \cdot \ a^2=6 \cdot \ 20^2=2400

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