Eduard @Eduard16180
Joined October 2020
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How self-evident is this? [What proofs can you come up with?]
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Steiner's theorem applies. That's all! geogebra.org/m/yAJ7UnNR
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The mathematical relation (x²/y² + x²/z² = 4) is valid in any regular decagon! 🚀
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Black moves and wins ...
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chessgames.com/perl/chessgam…
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Eduard retweeted
Crna @Crna97197085
Apr 24
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【オリジナル問題】１１ 図のような、∠ABC＝90°の台形ABCDがある。AB上に点Eをとると、AD＝EB、EC＝8cm、∠DCE＝∠ECB＝15°となった。このとき、四角形AECDの面積は[ ]cm^2である。
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