Before drawing, which four settings should be verified in OHMIC CAD?
Unit 12 · Lesson 05 · CAD, Scale Drawing & Spatial Design
Area, Perimeter and Material Schedules
Use live length and area analysis to estimate quantities and document assumptions.
Learning intention
Use accurate diagrams, definitions, measurements, and reasoning to use live length and area analysis to estimate quantities and document assumptions.
Success evidence
- Label the figure and units before calculating.
- Select and justify the governing definition, theorem, relationship, or construction.
- Show enough work that another learner can audit the conclusion.
- Check the result against the diagram, scale, and stated constraints.
Visual model
Use a local-first CAD environment to create precise, scaled, layered, measured, and exportable geometric designs.
\text{drawing length}=\text{actual length}\times\text{scale factor}A=lwP=2l+2w
Worked reasoning
Process: Set units and scale, construct with grid and snap, dimension critical objects, verify area and length, then export a print-ready artifact with a design note.
- Read the figure and rewrite all given information with correct notation.
- Identify the exact relationship that connects the known and unknown quantities.
- Substitute, construct, or prove one justified step at a time.
- State the result with units and a sentence explaining what it means.
Misconception check: A visually attractive drawing is not automatically precise; dimensions, scale, units, and constraints must be explicitly verified.
Khaemenes Academy · Open-Age Geometry
Area, Perimeter and Material Schedules
Find, construct, prove, or explain each result. Show reasoning and label units.
Name
Date
A 1:100 plan shows a 6.5 cm wall. Find the actual wall length.
Why place dimensions and walls on separate layers?
Which export best preserves editable project state?
Which export is best for sharp vector printing and visible geometry?
What evidence should accompany a CAD design defense?