Mathematics
Senior High
これについてAFGDとABFEのなす角なぜ90°なんですか？
A
教
教 p.143 問1
22020
を
219右の図の直方体に
おいて,次の2直
線のなす角を求め
A.
3
D
B.
C
1
E!
よ。
(1) AD と EF
H
F
G
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