Step 1: Understand the case:
The school wants a new garden with a lawn, flower beds, a fountain and a seating area.
It has no professional landscape architect.
So it will draw and plan the garden on its own using CAD software.
Step 2: Part (a) - Role of CAD in landscape design:
CAD means Computer Aided Design. It helps in the following ways.
1. It makes accurate 2D plans and 3D views of the garden.
2. It lets the school try different layouts and change them quickly.
3. It shows where the lawn, beds, fountain and seats will fit in the given space.
4. It gives exact sizes, so the quantity of soil, plants and material can be worked out.
5. It helps the school share and explain the design to staff and students before work begins.
Step 3: Part (b) - Two CAD software:
Two software that the school can use are AutoCAD and SketchUp.
Vectorworks Landmark and Lumion are other examples.
AutoCAD is good for precise plans. SketchUp is easy for 3D views.
Final Answer:
(a) CAD helps to draw, view, change and cost a garden design on the computer without a professional. (b) AutoCAD and SketchUp.