Mathematics
Senior High
（2）が−4、（3）が−2√2になる理由を教えてください！
9 右の図のようなひし形ABCD において,次の
D
2
内積を求めよ。
p.26
(1) AB AD
A
245°
•
(2) DA BC
(3) AB CB
ABCが取りる
B
20
20
C
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