Mathematics
Junior High
xが、2×∠EBD なのってなんでですか?
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(3)O E
D/62°
C
Al
B
0
ZEDB=ZADB=90°
だから,
ZEBD=180°- (90°+62°)
=28°
Zx=2×ZEBD
=2×28°=56°
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