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( 2).
4 || l ( AB ): x 14 || (A 1 B 1).
( AB ) (A 4 B 4 = AB ), D D 4.
D4E4 ^ A4B4.
5 ^ 4; 5 ^ AB: x45 ^ A4B4.
5 A 5 = B 5 = E 5, D D 5.
D 5 E 5 D AB. [ D 5 E 5 ]=| DE |
(3).
4 ^ (D), 4 ^ 1 Þ 4 ^ h Þ 1,4 ^ h1
1. ABC h (AE) 4 .
2. x 14 h 1 (A 1 E 1). 4 A 4 B 4 C 4.
1. (ABC) (3)).
2. (ABC) f
( A 1) 4 : x 24 ^ f 2
3. 4 A 4 B 4 C 4.
4. D 4 D 4.
5. D 4 A 4 B 4 C 4 E 4.
D 4 E 4 D ABC
(4).
4 ^ ( D ), 4 ^ 1 Þ 4 ^ h
5 II (D), 5 ^ 4
A 5 B 5 C 5 ABC
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. ABC ABD.
( 2 ).
1. 4
4 ^ 1 ; 4 || (AB): x14 || (A1B1)
2. 5
5 ^ 4; 5 ^ (AB): x45 ^ (A4B4)
D 5 A 5 C 5 ABC ABD
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