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A rectangular prism 3cm x 5cm x 9cm is painted mauve and is then cut into 1cm^3 cubes. What is the total unpainted surface area of these cubes?

 Jan 4, 2022
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3 x 5 x 9   is   135 cubes       total surface area    6 x 135 = 810 cm2

 

original painted area =   2 x    3x5      +    2 x    5 x 9     +    2 x    9 x 3    cm2

 

 

 you should be able to finish.......

 Jan 4, 2022

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