数学Aの図形です。教科書を読んでもさっぱり分かりませんでした。解説お願いします。

20 15 7. △ABC の内心をIとし, 直線 AI と辺BCとの 交点をD, △ABCの外接円との交点をEとす る。このとき,次のことを証明せよ。 (1) AD²=AB・AC-BD・CD (2) EB=EC=EI 8. 1辺の長さが2である右の図のような正八面体 ABCDEF を,直線AF を軸にして1回転させる。 (1) この正八面体の内部が通過する部分の体積 を求めよ。 (2) この正八面体の面が通過する部分の体積を 求めよ。 B B D A E 1 1 F C D

数学Aの図形です。黄色のラインを引いたところが分かりませんでした。解説よろしくお願いします。

15 10 6. 右の図において、 2つの円 00' は点Aで外 接している。 また. 直線BC は 00′ に, それぞれ点 B,Cで接している。このとき, ∠BAC=90° であることを証明せよ。 7. △ABCの内心をIとし 直線 AI と辺BCとの 交点を D, △ABCの外接円との交点をEとす る。このとき. 次のことを証明せよ。 (1) AD²=AB・AC-BD・CD (2) EB=EC=EI 8. 1辺の長さが2である右の図のような正八面体 ABCDEF を,直線AF を軸にして1回転させる。 B A D E A CE I

数学Aの図形です。16番の問題解説を読んだのですが2番が分かりませんでした。解説お願いします！！

• 64 第2章 図形の性質 BB 16 鋭角三角形 ABCの垂心Hを通る直線が辺AB, AC と交わる点をそれぞれD, E とし,Hを通り DE に垂直な直線とBCとの交点をFとする。また,Cを 通り FH に平行な直線と直線BH との交点をKとする。次のことを証明せよ。 (1) KE // BD (2) DH: HE=BF:FC 17 △ABC の内心をⅠ, △IBCの外心をDとすると, 4点 A, B, C,Dは1つの 38 ARCE 117 31 円周上にあることを証明せよ。 18 1辺の長さが5の正八面体 ABCDEF の各面の重 心を頂点とする立体について,次の問いに答えよ。 (1) この立体の名称を答えよ。 (2) この立体の体積を求めよ。 ての面が三角形である凸多面体がある。 S8 B C きめ A F E ・D

1枚目の本文に対する2枚目の問題の答えを3-イか3-ロで迷っているのですが、どちらが正解かわかりません。どなたか理由もあわせて教えてもらいたいです。 よろしくお願いします！

Omoiyari is said to be a key concept of the Japanese mentality. (Its primary meaning is the ability to imagine other people's feelings. Japanese people's good manners have often (2) been associated with it and reported in news articles. For example, Japanese soccer supporters cleaned up the stadium after the matches at the World Cup, actions that were praised by the foreign media. Some experts say the supporters' behavior is related to education in Japan, where children clean their classrooms every day. Another example was seen during the frequent natural disasters. Even in such situations, many people still kept calm and patiently waited in lines for emergency supplies. JANET [ 3-1 ] According to a survey by an organization to promote good manners in Tokyo, less than 30 percent of Tokyo residents think people in Tokyo have good manners. [ 3-□ ] For example, Tokyo residents notice bad manners on the train. (4)Some young people sit in priority seats and do not give sit (5). V₂ 1 up their seats to the elderly, and others put on makeup. [ 3-> ] In an effort to get the passengers to 52 act more (5), railway companies display posters, saying things such as, "Please line up and c wait your turn" or "Please switch your phone to silent mode while ( 6-a) the train." 5 [ 3-= ] Omoiyari is often seen in school mottoes and emphasized in moral education at school. Some of the values that students are ( 6-b) include respecting the elderly, helping those with disabilities, and keeping promises. Students also take turns (6-c) in charge of cleaning the classroom, serving lunch, taking care of plants and animals. In addition, volunteer clubs collect money for charitable organizations and members visit elderly people in nursing homes. In moral education class, students read stories and discuss the topics in them. The teacher facilitates the discussion and the students draw their own conclusions. (Nakaya, et al., Discuss the Changing World, Seibido)

高校数学です。分かる方教えてほしいです。

3. Paul and Polly sell lemonade in front of their house in the summer. During the month of June, they sold about 26 cups of lemonade a day at a price of $0.50 per cup. In July, they plan to increase their cups sold by 2 cups every day with some clever new advertising. They will also decrease the price per cup by 1 cent every day. Write an equation for a function L(d) that gives the amount of money Paul and Polly make selling lemonade on day d in July.

なぜmoreがその位置に来るのですか？

316 必要以上にお金を使ってはいけない。 (1語不要) Don't (is/money/more/ need / needed / spend / than). ...anwingwort ode or a <学習院 Ruinoyd balli arw notiaoq sd T Instagnon girlguoredt as se idguody are =odw $$ oriw ng started 4

manyとa lot ofの違いを教えてください🙇‍♀️

このお話はまとめるとどういう話なのでしょうか？

Mama's Bank Account (1) I am Katrin. When I was a child, all my family lived in a small house in San Francisco. My family members were Mama, Papa, my elder brother Nels, my younger sisters Christine and Dagmar, and I. We were immigrants from Norway. I remember that every Saturday night Papa brought home a little envelope with his pay in it. Mama would sit down by the kitchen table with a serious look. She was counting it out. There would be several piles of coins on the table. "These are the rent," Mama would say, and set aside a big pile of coins. "For the grocer." She set aside another pile of coins. "For Katrin's shoes," and Mama counted out the coins. "I'll need a notebook this week." Nels said, and Mama put aside a ten-cent coin. At last, Papa would ask, "Is that all?" Mama would nod and say, "That's good. We don't have to go to the bank to withdraw money."

よみにくいのですが、英検の添削お願いします！！

っての して 5 more 予想さ いる。 喜ば 容は, より られ t to そ It, ce 的 TOPIC Some supermarkets have begun to charge people for plastic bags. Do you think this is a good idea or not? POINTS Environment Cost Convenience I think that some supermarkets have begun to charge people for plastic bags is a good idea. I have two reasons why I think so. To begin with, it is good for the environment. There are a lot of plastic garbages all over the world. We should reduce them. you buy Next, it costs money to use plastic bags. If 1日目 them every time, you will spend much money. It is better to spend on other things. Money In conclution, people do not use do not use plastic bags is good.

誰かわかる方居ましたら教えてください(❁ᴗ͈ˬᴗ͈)

2 日本語を参考に,空所に適語を補いましょう。 1. A: 楽しい休暇になりますように。 2. 今夜はテレビでよい番組があります。 私はそれを見るつもりです。 A: Enjoy your vacation. B: Thank you. I ( There's a good program on TV tonight. I'm ( 3.今夜は外出しません。 家にいます。 I'm not ( 4. テストは難しいものになると思いますか。 B: ありがとう。 葉書を送りますよ。 )out tonight. I'm staying home. Do you think the test will ( ) difficult? 5. 傘を持って行くつもりです。雨になると思いますから。 3 日本語を参考に I'm going to ( 6. この列車は何時にニューヨークに着きますか。 What time does this train ( ) to New York? ) an umbrella with me. I think it ( 内の語を並べかえましょう。 2. もしお望みなら、お金を少し貸してあげますよ。 I'll (lend / money/some/you) if you want. ) send you a postcard. ) to watch it. 1. A: 私のスーツケースはとても重い B: ぼくが持ってあげよう。 A: My suitcase is very heavy. B: I'll (carry / for / it / you). 3. あなたはパーティーにボブを招待するつもりですか。 Are you going (Bob / invite / to / to) your party? 4. 今夜のパーティーには何を着て行くつもりですか。 What are you (going/to/to/wear) the party tonight? ) rain. 5. アンは電車で来ることになっています。 駅まで迎えに行くつもりです。 Ann (by/coming/is/train). I'm going (at/ her/meet / to) the station.