simple 3d rectangle
This will teach you how to make a simple 3d rectangle using sketchup.
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Step 1: Make a 2d rectangle
Click the pencil
Click at the origin and drag to desired length
Make a line perpendicular to the previously drawn line
Click the rectangle tool and click the 2 endpoints
Continue to step 2
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Step 2: Create the sides
Make a vertical line on one of the vertices of the rectangle
Use the rectangle tool to create a side
Repeat the previous step 3 times