You can change the size of a selected entity by scaling it in relation to a base point. You can change the size of an entity by specifying a base point and a length, which is used as a scale factor based on the current drawing units, or by specifying a scale factor in 'Input Bar'. To use this tool select 'Scale' from Modify menu or select icon from Editing toolbar.By default this option is disable. To make enable you have to select the desire entity.

Steps to Scale  the Entity :

Fig 1.

Fig. 2

In above case a circle is scaled. In this it's centre is taken as base point and three is taken as scale factor. Fig.1 is before scaling the circle and Fig. 2 After scaling it.

See Also