1.Using a scale, tints, shades, and all grays in between are concepts of what? 2. Actual and implied are examples. You find this on tree bark, bricks, grass, etc.

3.Two-dimensional, Three-dimensional, positive, and negative are examples of what?

i think it's about 10 mins.

actually i think that's wrong, but i don't know how to delete this.

but who knows it might be right.

cad, or computer-aided design and drafting (cadd), is a software for design and technical documentation, which is an automated process as opposed to the manual drawing of plans. this gives a person an advance in making plans as an architect in a short period of time. one who can render plans through this software will gain a skill that is better than one who makes plans manually. this is a skill some companies look for in an employee.