Question Detail
Question
In the detailed construction of an isometric circle (as described using four centers), what is the purpose of joining the longest diagonal (BD) through the center?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Page 23 outlines the steps for constructing an isometric circle using the 4-center method. Joining the longest diagonal (BD) is a crucial step ('Join the longest diagonal (BD) through centre.') to set up the construction of the ellipse, as it helps identify the points (R and S) on the diagonal from which arcs will be drawn, defining the major axis of the ellipse.
Hint
This diagonal helps locate key points that form part of the elliptical shape and its construction centers.