13. B = 5.5cm
P = 7cm
C = 4.4cm
5.5 = B < D <
7 = P < T <
4.4 = C < S <
2C =6.16
P = 7
3B = 9.35
(1+2/ 3)C = 9.58
B = 5.5
P/ 2 = 5
5.2 < D < 6.16
7 < T < 9.35
4.4 < S < 5
D
T
S
穴の辺の長さ
立体の辺の長さ
16. B
P
C
D
T
S
S
T/ 3
< B < D
(2 3 - 3)T
< C < S
< P < T
D
D/ 2
2S
B < D <
P < T <
C < S <
2C
3B
B
まとめ
《立体の辺の長さ》 《穴の辺の長さ》
(1+2/ 3)C
P
P/ 2
意外と簡単に作れた!!