Mathematics
Senior High
Solved
AO=BO=COの理由を教えてください
UT
5
下の図の△ABCにおいて, 0は外心,
(1)
B
30°
x=180°-30°×2
2y+25×2+30×2=180
x=180°-60°
2y+50°+60° 180°
x=120°
2y=70°
y=35
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