In SOLIDWORKS, dimensions drive the model geometry; changing dimensions changes the shape of the model. You can relate dimensions to each other in equations.
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Open a sketch, sketch a rectangle, and dimension the rectangle.
- Modify the dimensions as needed while creating the sketch.
- Extrude a block base feature.
- Complete the feature to close the sketch and show the solid in shaded mode.
- To modify the block, edit the sketch, double-click a dimension and modify the value.
- Exit the sketch to rebuild the solid with the new dimension.