Note that: The Length/ the Size presented in these Tutorial is an Approximate only, not the Actual Size!

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Step #1: insert a Rectangle Shape in your Microsoft PowerPoint
 

Step #2: Round it off to the Nearest Integer, excluding the Decimal. (This applies to the Size)
 

Step #3: Right-Click and then Format Shape and then Effect Options and then 3D Rotation, and then on the Presets, Choose the Parallel which is in the Off Axis 1: Top
 

Step #4: Insert a Line, and then Draw a Straight Line, by holding the Shift Button and pressing the Left Mouse Click to Click and Drag it.
 

Step #5: Change the Length to 7cm or 2.75591inch
 

Step #6: Increase the Depth (to match where the line ends).
 

Step #7: You can now remove the line
 

Step #8: Duplicate the Cube, now to make it transparent, Click the Second Cube, and then Right-Click, Shape Format and then, Effect Options, and then on the Special Effect, Choose the Wireframe to apply it.
 

Step #9 (Optional): If you want to increase it's line, you can Click the Contour and then input something to increase it's size.
 

Step #10: To change the 3D Cube in something different 3D Shapes, Click on the 3D Cube, then Shape Format, on the Edit Shape Option, Click on the Change Shape, Change it something you want, here we're using Trapezoid

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For more Details, Watch the Embeded Video from Our YouTube Channel, below!!