What is 'Lead Time' Lead time is the amount of time that elapses between when a process starts and its completion. Lead time is examined closely in manufacturing, supply chain management and project management, as companies want to reduce the amount of time it takes to deliver products to the market. The amount of time that elapses between when a process starts and when it is completed.  takes to deliver products to the market.
There would be arrows connecting the Rectangle to the Square and the Rhombus to the square, again indicating that sometimes a rectangle is square and sometimes a rhombus is a square. If the shape is below another, then it is always the shape above it as well. So a rhombus is always a parallelogram, a square is always a rectangle, and always a parallelogram, and always a quadrilateral, etc. If I could draw the arrows in this reply it would look better. Also, we have gone through the definitions of each special quadrilateral before we look at the hierarchy
Rhombus plural: rhombi. Definition: A quadrilateral with all four sides equal in length. Try this Drag the orange dots on each vertex to reshape the rhombus. Notice how the four sides remain the same length and the opposite sides remain parallel. A rhombus is actually just a special type of parallelogram. Recall that in a parallelogram each pair of opposite sides are equal in length. With a rhombus, all four sides are the same length.It therefore has all the properties of a parallelogram. See Definition of a parallelogram. Its a bit like a square that can 'lean over' and the interior angles need not be 90Â°. Sometimes called a 'diamond' or 'lozenge' shape.