解答のOM⊥BCになる理由が分かりせん。教えてください💦

EBCに下ろした垂線を り,線分 CD が円の直径 p.406 基本事項 ① ② 円に関する定理や性質 (*) ある。) フェ 中点連結定理 コ点2つで平行と半分 DBC, ∠DACは半円の に対する円周角 問題は, △ABC が鈍角 三のときも成り立つ。 90° または ∠B=90° の 角形のときは (2) の四 できない。 利用)。 0 (TRIANO) も利用。 =∠CAHであ MAA 050 基本例題12 重心 外心垂心の関係 正三角形でない △ABCの重心G,外心O,垂心Hは一直線上にあって,重心は 外心と垂心を結ぶ線分を,外心の方から1:2に内分することを証明せよ。なお, 基本例題 71 の結果を利用してもよい。 p.406, 407 基本事項 ①1, ②, ④4 指針 証明することは,次の [1], [2] である。 [1] 3点 G, 0, Hが一直線上にある。 これを示すには,直線 OH上に点Gがあることを示せばよい。 それには, OH と中線 AM の交点を G′として, G′とGが一致することを示す。 [2] 重心 G が線分 OH を1:2に内分する,つまり OG: GH=1:2をいう。 AH // OM に注目して,平行線と線分の比の性質を利用する。 …… すなわち 練習 . 右の図において,直線 OH と △ABC の 中線 AMとの交点を G′ とする。 AH⊥BC, OM IBCより, AH// OM であるから AG' G'M=AH : OM 72 =20M:OMBI B MAD" +4BD"-2A (G) =2:1 SBD ⓘ TAM は中線であるから, G′ は△ABC の重心G と一致する。 よって,外心 0,垂心 H, 重心Gは一直線上にありA HG : OG = AG:GM=2:1> OG:GH=1:2 OPT" # C=AD'+12 検討 三角形の外心,内心、重心,垂心の間の関係 心,外心の性質から。 0. GH U18 08,201 2009 基本例題71 の結果から。 M A ①外心は三角形の3辺の中点を結ぶ三角形の垂心である (練習 72)。 円劇・阿 ②重心は3辺の中点を結ぶ三角形の重心である(練習70) 内 ③ 正三角形の外心,内心,重心,垂心は一致する (練習 71)。 したがって, 正三角形ではオイ ラー線は定義できない。 Acti (1) 検討 (この例題の直線OH) を 外心,重心,垂心が通る直線 オイラー線という。ただし 正三角形ではオイラー線は定 義できない。下の 検討 ③ 参 照。 (1) PUTO DAA △ABCの辺BC, CA, ABの中点をそれぞれL, M, N とする Oは 413 3章 10 三角形の辺の比、五心

至急！解説お願いします！🙇‍♂️ (1)は276番目 (2)はCMTOEUPが答えです。

C, 0, M, P, U, T, E の7文字を全部使ってできる文字列を,アルファベット順の辞書 式に並べる。 (1) COMPUTE は何番目の文字列になるか。 (2) 200 番目の文字列は何か。 CE MOPTU

ある塾の英語の長文テストなんですけど、問一の答えが順番に、3.2.4と書いてるんですが全く納得いきません。Part1が4でなく、3なのはまあ百歩譲れますが、Part3が4になる意味が分かりません。風力発電の環境面での利点なんて一文字も書いてない気がします 問題の作成ミスでし... Read More

You are preparing for a speech about alternative energy forms. You have found a journal article about wind energy. You are going to read the article and take notes. Wind Energy [Part 1] Scientists are always looking for more sustainable and cost-effective forms of energy, and many people believe wind energy is the best option available. Wind is a product of heat from the sun, so the energy supply will never run out. Wind does not pollute the air, water, or ground as it produces energy. Another major benefit of wind energy is that it requires no water. In contrast, traditional forms of energy production all require water for cooling. Due to its efficiency, scientists have worked to increase the capacity of wind production units. They hope to develop wind energy into a large-scale alternative to fossil fuels. [Part 2] Wind energy can be produced using offshore wind or land-based wind. The primary benefit of offshore wind collection is that it is more efficient because offshore wind blows more consistently and with more power than land-based wind. To take advantage of the steadier wind, offshore wind production units are bigger and have more capacity. Therefore, the energy acquired from offshore wind can produce significantly more electricity than land-based wind energy. Wind production units located in the sea off the coasts of big cities can efficiently provide energy to many people, while land-based wind production units take up valuable land space and require complicated transportation efforts. However, since it is a newer technology, offshore wind energy is currently more expensive than land-based wind energy. [Part 3] Even though it actually has ancient roots, producing energy from wind is usually thought of as a modern alternative to burning fossil fuels. Initially, wind energy provided power for electricity. But during the mid-20th century, it was replaced by fossil fuel resources. Unfortunately, the pollution created from the burning of fossil fuels is a major cause of global warming. This has forced scientists to develop more sustainable and cost-effective forms of wind energy. Currently, most offshore wind resources are located in coastal waters which are too deep for current wind energy technology. However, engineers are working to develop floating production units that can withstand the hard environment of the ocean, such as storm waves, hurricane-force winds, and ice flows. These developments offer wind as an effective source of energy without damaging the environment. Complete the notes by filling in 1 to Outline: Part 1: 8 Notes

（4）を訳したいのですが、どこで区切るのかが分からずうまく訳せません。どなたか解説をお願いします。

with one's *spouse, problems at work, speaking in public, or even telling a lie. But it can also be brought on by something you enjoy, like the caffeine in a cup of coffee, cigarettes, or alcohol. There are, fortunately, ways to lower blood pressure-ways (4) 51 25

5番目の問題はなぜ2になるのですか？

Reading Many overseas schools also have school uniforms. countries? The uniforms in South Korea are quite like those in Japan. Many students wear jackets and ties. The uniforms in Australia also look much like ours. (1 ), the traditional costume is adopted as the school uniform. ( 2 ), at some high schools in Vietnam, girls wear the native costume called "ao dai." In Bhutan, all schools have adopted the native costumes called "gho" and "kira" as uniforms. What are uniforms like in other What are The designs of some uniforms differ because of the religious backgrounds of the students. In Malaysia, girls wear different kinds of uniforms because of their religion. Some girls show their hair, but others cover it with a head scarf. 1. Choose the appropriate phrase for blanks (1) and ( 2 ) from a. to d. ca (1) a (2). a. For example b. For that reason c. In some countries d. In the past 2. What does the underlined (1) refer to? Answer by using a phrase in the passage. those : The school uniforms 3. How do girls in Malaysia wear uniforms in different ways? Answer by using a sentence in the passage. Some girls showe haz other cover) it with a head scarf their hair, but 4. Answer the following question in English. What do many students wear in South Korea? Jackets I ever fin ma 5. Choose one sentence that fits the passage. (1) The school uniforms in Australia are similar to those in Japan. (2) Students in South Korea sometimes wear the traditional costume at school. (3) In Vietnam and Bhutan, all school uniforms are the native costume. (4) School uniforms are not influenced by religion in Asian countries. (2) (2)_((13)) bivibnt sided beinnow yoddasb huo Vads\acting lourdsal al Uniforms LESSON 3 |三者

答えを全て教えていただきたいです🙇

3 次のA~Cの問 ▲ 次の問1~5の英文の空所に入れるのに最も適当なものを,それぞれ下の1~4のうち から一つずつ選び, 番号で答えよ。 問1 Clerk : May I help you? Customer: My ( ) is getting poorer, so I need stronger glasses. 3 sound 4 view 1 hearing 2 sight 2 () the thirty students in the class, Mika is the best at speaking English. 3 In 4 Of 1 As 2 For 3 Mike: Why don't you call Meg and ask her for a date? Jim : I'm a poor talker, so the phone is not an option. I'll e-mail her ( ). 1 as well 2 besides 3 in turn 4 instead 4 Wang: You speak Chinese very fluently. Tom : Thank you. I ( ) in China for five years when I was a child. 1 had lived 2 have been living 3 have lived 4 lived ) letting me study abroad. 5 Kate : I finally talked my parents ( Theresa That's good. Living in a foreign country will be a good experience. 4 to 1 from 2 into 3 out of

物理、2乗平均速度についてです🙇‍♀️ 黄色文字で書いてある、物質量を分子数で割るとアボガドロ定数が出てくる理由がわからないので教えて欲しいです。 また、一番下の紫野矢印のところ、原子量で書き換えが出来ると習ったのですが、どうしてでしょうか？？ 化学もやってる... Read More

2乗平均速度 3 ~ 1/2 mi² = ²/² OPT 分子数 BURT 20 h² www Vie → (√ño Stvdine Wm 分子量 3RT NAM 3RT Mox 原子量 P (0) $2 Naz

インターネットで見つけた文章なので間違いかもしれません。この文章の分構造が分かる方はいらっしゃいますでしょうか? もし間違っていれば、違うと一声かけていただけると非常にありがたいです。 You lead a lifestyle that if I adopted woul... Read More

教えてください

10 In those days, not that many soccer grounds were covered with green turf. In turf. In The black-and- It was the late 1960s, this type of ball was introduced in Europe. white soccer ball was used in the World Cup for the first time in 1970. adopted so that people could see the ball more clearly when watching the game ORIENT 4

至急！ 解き方を教えてください🙇‍♂️ 答えは −2＜k＜2 です。

0,83 A COPT 006 RAJS#00A 08 x についての不等式 2k-1<x<7 -2k-5<x<k+1 を同時に満たすx が存在するようなkの値の範囲を求めよ。 W 01 A 0 21