Envelopments (Leaving Cert DCG): Quizzes

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Envelopments
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What is envelopment in technical drawing?

Wrapping flat patterns around objects

How does envelopment relate to development?

They are opposite processes

What must the flat development pattern contain?

All surfaces to cover the object

What is a partial envelopment?

Only part of object's surface covered

How do partial envelopments appear when laid flat?

More complex than when wrapped

For a cylinder with radius RR, what is the development length?

2πR2\pi R

What is the first step in creating a pentagonal prism envelopment?

Start with orthographic views

Which views are needed for orthographic projection?

Front, end elevation & plan

Which is a practical application of envelopments?

Product packaging design

Why must cylinder development length equal circumference?

For perfect fit without gaps/overlaps

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