Triangle
Dashed line: fold toward you (valley). Dash-dot line: fold away (mountain). The arrow shows which way the paper moves.
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1. Fold the top left corner over so it touches the bottom right corner. Press the fold flat.
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Done. Now you have a triangle.
A traditional model. The first fold in nearly every folding tradition.
From CreasePals · sparkanvil.org/play/creasepalsPrinted Printed from this device. Nothing you made here was sent anywhere.