Mathematics
Junior High
Resolved
中3 数学
図形 角度を求める問題
青文字は回答の解説を書き写したものです.
1行目の意味は分かるのですが ,
2行目がなぜ2∠x+∠xになるのか分かりません.
教えていただきたいです.
(3) OA=AB=BC=CD
0
x A
90°
Je
B D
2x
24
D
LBCA=LBAC = 2<a
LBDC = LDBC = 2cntca
<+3=900
Lx = 22.5°
=340
x
2
-80 - (1802)
180-180-+2m = 2x
22.5°
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