Paano Mag Layout Ng Rectangle To Round 90 Degrees Elbow Duct

Itong video ay ipapakita ko sa inyo kung paano mag layout ng rectangle to round 90 degrees elbow gamit ang triangulation method galing sa elevation view.
Song Used:
De0rbit - www.youtube.co....
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Timestamps:
[0:00] - Intro
[0:27] - Layout
[28:00] - Outro