Pictorial Projection 1 (Leaving Cert DCG): Flashcards

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Orthographic projection purpose

Foundation for all technical drawing

What front elevation shows

Object from front, displays stepped profile

What end elevation reveals

Side view showing depth & features not visible from front

What plan view provides

Bird's eye view from above, shows footprint & internal features

What isometric view shows

Three faces of the object simultaneously

Isometric cube line angle

30°30° lines

Measuring rule in isometric projection

Transfer measurements from orthographic views, don't scale directly

Regular pentagon internal angles

108°108° each

Pentagon side dimension (typical)

45mm45mm

Construction lines requirement

Light but visible to demonstrate proper drafting technique

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