1

C h i b a I n s t i t u t e o f Te c h n o l o g y

2

( 1) l , A l , 2A

2l , A 2l , 2A P

P

3

( 2) XYZ

X Y Z 90

A 360 AA 2

4

G1

G2 G2

N1 N2

T1 T2

D1 D2

Gr

Gr N1

N2

5

G1 T1 N1 T1

N1 T2 T1

N2 N1

Gr N1 N2

1

6

7

Rred

Rwhite Rblue

1 Rred Rwhite Rblue 2 Rred Rwhite

a b Rab

3 Rred Rwhite

c d Rcd

4 Rred Rwhite Rblue

e f Ref

5) 3

5 3 4

e f Vef Rblue Vblue

Rblue Iblue Rred Ired Rwhite

Iwhite

4) 3

Rred Rwhite a

1

b

c

2

d Rwhite

Rblue

Rred

e

3

Rwhite f

Rblue

Rred

e

4

Rwhite f

Rred

8

Rgreen 5 619 35

1 5

2 6

3 1) 2)

1) 2)

40 OFFON

36LON LOFF min

1 ON OFF41

64 OFF

Rgreen

6 2

5 1

9

2 1)

7A

B

2 A B L

LON

LOFF

3 2)

8 PA

PB

min

36 38 40 42 44 46 48 50 52 54 56 58 60 62 64

37 39 41 43 45 47 49 51 53 55 57 59 61 63

ABL

7L 20

PA

PB

10

11

12

13

14

15

16

17

Golden ratio and regular pentagon

0.618:0.382

Fig. 1 egular pentagon inscribed in a circle.

regular triangle square regular hexagon

vertex

(Fig. 1) diagonal

(a) interior angle 1 (b)

1 3 1

isosceles triangle

similarity

18

0.618:0.382

1 (a)2 (b)3 5cm

(1) 5cm(2) perpendicular bisector

(3)(4)

(5)(6)

(7)

(8)4 10cm

19

20

21

22

23

24

25

26

•

•–––

8

•

•

9

(1) WBS

(2)

27

SNS

(1)

(2)

28