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9 Folding and Angles
Basic Concepts Folding Origami Paper to Form Equilateral Triangles
How to fold equilateral triangles with origami paper.
A D A D AED
BC BC BC
Fold the paper Fold the corners Triangle BEC is
in half. Then, A and D such that an equilateral
unfold it. they lie on the triangle.
folded center line.
Example Explain why triangle BEC is an equilateral triangle.
A D
E
BC
Class Notes
Since ABCD is a square, lines AB, BC, and CD are equal.
When the paper is folded, line AB becomes BE and line CD becomes CE. Therefore,
line AB line and line CD line .
Lines BE, , and BC are equal. Therefore triangle BEC is an .
76 NUMINO Challenge B2
Basic Concepts Folding Origami Paper to Form Equilateral Triangles
How to fold equilateral triangles with origami paper.
A D A D AED
BC BC BC
Fold the paper Fold the corners Triangle BEC is
in half. Then, A and D such that an equilateral
unfold it. they lie on the triangle.
folded center line.
Example Explain why triangle BEC is an equilateral triangle.
A D
E
BC
Class Notes
Since ABCD is a square, lines AB, BC, and CD are equal.
When the paper is folded, line AB becomes BE and line CD becomes CE. Therefore,
line AB line and line CD line .
Lines BE, , and BC are equal. Therefore triangle BEC is an .
76 NUMINO Challenge B2
