LEARN · EXPLAIN · REVISE

In the 45° half-depth oblique convention, an original depth is d. Find its drawn length.

Read the idea, work independently, then explain what changed.

TOPIC 01

Introduction to solid geometry: mixed assessment

A mixed assessment: identify the method, justify it and revise your reasoning.

Use one hint at a time. A correction explains what changed, not just the final answer.

01 / Transfer#Your turn

d=18

Skills and prerequisite lessons

Working and explanation

BUILD THE REASONING

Hint 1

Distinguish the actual spatial object from the stated oblique drawing convention.

Hint 2

The receding-axis scale is one half.

Worked solution

Distinguish the actual spatial object from the stated oblique drawing convention.
Calculate or simplify this relation.
$d'=18/2=9$
This is a drawing convention, not a change in the solid.

The requested value is 9.

Checks and common pitfalls: This is a drawing convention, not a change in the solid.

Think first. Reveal a hint when the class is ready.

Teacher preparation and assessment