AutoCAD hotkeys — selecting the correct isoplane before drawing an isocircle To create an isometric circle representing a hole on the <top> surface of a box, which function key is used to scroll through isoplanes until the correct one is active?

Introduction / Context:
When drafting isometric views in AutoCAD, the isoplane defines which pair of 30-degree axes is active (Top, Left, or Right). Choosing the correct isoplane is essential before creating isocircles for holes or cylindrical features so they align visually with the surface on which they lie.

Given Data / Assumptions:

• An isocircle (Ellipse command with Isocircle) must be drawn on the top face of a box.
• The user must switch to the matching isoplane for that face.
• AutoCAD provides a function key to cycle isoplanes.

Concept / Approach:
AutoCAD maps isoplane toggling to F5. Pressing F5 cycles through Isoplane Top, Left, and Right. Once the correct isoplane is active, the Ellipse command with Isocircle option produces the proper ellipse representing a circle in isometric view on that face.

Step-by-Step Solution:

Verification / Alternative check:
Attempting to place the isocircle on the wrong isoplane produces an ellipse oriented for a side face, which looks incorrect on the top face; switching with F5 fixes orientation immediately.

Why Other Options Are Wrong:

• F1: Help.
• F3: Object Snap toggle.
• F8: Ortho mode.
• F9: Snap mode; not used for isoplanes.

Common Pitfalls:

• Forgetting to change isoplane before drawing results in repeated redrawing; always set isoplane first.

Final Answer:
F5