図形の性質

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ヘロンの公式とは？ヘロンの公式の証明と使い方(演習問題付き）

みなさん、こんにちは。今回のテーマは【ヘロンの公式】について解説します。ヘロンの公式とは、簡単に言うと角度がわからなくても三角形の面積を求められるという公式です。「三角形の面積の計算に時間がかかってしまいます」「角度が分からなくて解けず...

図形の性質

三角形の面積比とは？三角形の面積比の求め方を分かりやすく解説

みなさん、こんにちは。数学ⅠAのコーナーです。今回のテーマは【三角形の面積比】です。三角形の面積比と言われても、これまで習ってきた「比」と何が違うのかピンとこない人も多いでしょう。今回はこんな疑問にお答えします。「習うより慣れよ」という...

図形の性質

中線定理とは？中線定理の証明と練習問題

みなさん、こんにちは。数学ⅠAのコーナーです。今回のテーマは【中線定理】です。定理の証明は、よく問題に出されます。中線定理も例外ではなく、しっかりと証明方法を押さえておくのが良いでしょう。今回は、三平方の定理による証明、余弦定理による...

図形の性質

スポンサーリンク

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