Mathematics
Senior High
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赤の波線の部分の式がどうして成り立つのかがわかりません、、(><)どなたかわかる方教えて欲しいです🙏🙏

(3) DとEを通る直線を引く。 ZADC=ZDAE+LAED+ZCED+ZDCE =20°+ZAEC+19° 20°0 -41° ID 0020十7 -E =20°+41°+19° B 0 -180°-0 19° =80° 四角形 ABCD は円に内接しているから, 0+ZADC=180° より A 0=180°-ZADC=180°-80°=100° LaURの

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