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数学 中学生

1番最後の問題の③の(2)を詳しく教えてください🙇‍♀️ ちなみに答えは¹∕₃aです

を作り、 の厚き 大悟さんは,家の近くにある三角形の公園の形に興味をもち,真上から見た図をかいて考 5 えた。0~③に答えなさい。 右の図のように, 公園を真上から見た図を△ABCと すると,公園は線分EDと線分ECで3つの広場に分け られている。 り,辺ACに垂直な直線と辺ABとの交点である。また, △AED=D△CEDであり, ZECDの大きさがわか ZCEBの大きさを求めることができ, 辺AB の長さと,△AEDと△CEBの面積の比がわかると, 線分EBの長さを求めることができる。 A 点Dは辺ACの中点で,点Eは点Dを通 あ) 42 い) ると、 an a42 46 E 148 43 B C ① 下線部あの点Dを, 定規とコンパスを使って作図しなさい。作図に使った線は残しておきなさい。 ② 下線部いを大悟さんは, 次のように証明した。 なさい。また, <証明> △AEDと△CEDにおいて, EDは共通だから, ED=ED EDIACだから, ZEDA=Z| |には適当な角を表す記号を書き入れ には証明の続きを書き, <証明>を完成させなさい。 えた。 =90°……(i) ③公園の図において, ZECD=42°であり, △AEDの面積と△CEBの面積は等しい。 (1), (2) に答えなさい。 IC (1)下線部(う)について, ZCEBの大きさを求めなさい。 (2) 下線部え)について, AB=amとしたとき, 線分EBの長さをaを使った最も簡単な式で表 しなさい。

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英語 中学生

日本語の意味が分かりません💦 教えて下さると助かります! すみませんがお願いします!

【ゆりさんのスピーチ】 Do you know that a lot of people in Shiga Prefecture have worked as volunteers? I read about it in the newspaper and I thought of one person, Mr. Ikeda. I think most of you know him. He lives near here and he takes care of the flowers along the road to our school. One day, I said to him, “Thank you very much for taking care of the flowers. beautiful.” He smiled and said to me, “It's my pleasure. I'm glad that you I like seeing them. They're very enjoy O them. It's only a small thing, but I wanted to do it for the people in our town.” I wanted to do something for other people like Mr. Ikeda. So I decided to clean the lakeshore whenI take a walk every morning. When I walk along the lakeshore, I always enjoy the beautiful view. I ② (enjoy / to / wanted / everyone ) the beautiful view of Lake Biwa like me. While I am picking up garbage on the lakeshore, many people say to me, “Thank you.” When I hear that, I am very happy. After strong winds, the lakeshore gets very dirty. Cleaning it is hard, but I don't feel tired because 3) When I was a child, I only did things that other people asked me to do. Through this experience, I've learned that it's important to decide what to do for others by myself. Aweek ago, I had another wonderful experience. When I was cleaning the lakeshore, I met a woman who was doing the same thing. She said to me, Thank you for keeping the lakeshore clean. I see you when I take a walk every morning. I was moved, so I began to clean like you.” I was glad to hear that. I found that even a small thing can move people if we do it for others. I also learned that volunteer work will spread to other people in this way. I hope everyone will do something for other people like Mr. Ikeda. (注)It's my pleasure. どういたしまして。 lakeshore 湖岸 view 眺め garbage ごみ dirty よごれた by myself 自分で move (d) move(感動させる)の過去分詞形

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