Mathematics
Senior High
Solved
数学Aです
なぜ二等辺三角形といいきれるのでしょうか
雪 76 右の図において,
xとyの値を求めよ。
(1) A
B
/50°
130°
XC
D
76 (1) ZCOD=2×50°
00-80=100°
△OCD は二等辺三角形だから
x+x+100°=180°
x=40°
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