MATHEMATICS AND ORIGAMI

Mathematics and Origami

8.2.5 STELLATE TRIANGLE

Now is the occasion to recall point 6.9 (stellate rectangle) in which the triangle was also men-

tioned. Now, lower left figure represents a lit arquitectonic stellate triangle; the figure at its

right is the same, but unlit.

8.2.6 SQUARE / SET SQUARE

ang BAC = 45º (complementary angles bisector)

ang DAE = 60º (equilateral triangle)

ang EAC = 30º ; ang ACE = 60º ; ang ACF = 120º

ang BCF = 60º ; ang BCA= 60º

1

2

1

2

A

B C

D