1枚目の下の方にあるオレンジマーカーの部分について質問です。 2枚目のように展開図を書いたのですがこの図からは2θかなと思いました。なぜ答えがθなのですか？

の〇つの〇24 gimfeoyrgeeif OA =ニOB =OC=ニ4 AB=BCニCA ニ2/2 である四面体 OA (!) 頂点O〇から底面 ABC に下ろした垂線を OH とすると AH ニ 5 OHニ pal であるから、四面体 OABCの体前は 加>記 ニン@^ーデ9 > シコ ある。 ニンBoOG呈 さらに, 4点0, AB cid する ノAoBテク (@ 点Aから辺 OB に下ろした垂線を AD,点 D から辺OC に Fろした生線 | ロコ ビビコ とおくとcos2ー 戸光二 であるか5 6p=ビタコ エコ したがって, 四面体 OADE の体積 は ッ-ュの 5の3 でぁり, AH は外 6 272 接円の半径であるから, 正弦定理により 2AHニ=-jm60' (1) 04=ニOB=OC より, 古は正三角形ABC の外心 放 | ゆえに, 直角三角形OAH において OH = /OAーAFTE を-(容) 0 1 (四面体の体積) 理(て軸因 したがって, 四面体 OABC の体積 は ロ 同人 2/30 4710 | エメ(旗面積)X(高る) レニ・AABC-OHニ= ュ・(す-272 272・sn60)-当ニゴー 3 また, 4 点 0, A, B, Cを通る球の中心をP とすると, 点Pは線分 OH 上にある。 2 2 直角三角形 PAH において Z?= (人縮- (内) 還 = これを解いて = ミキ (②⑫ AOAB において, 余融定理により 0A*+OB*ニABI ポキダー(272) 3 2・OA・OB 。 2・4・4 4 ゆえに, 直角三角形 OAD, ODE において OD = OAcosの= 3, OE = ODcos2 = 8 4 また, へOAE において, 余弦定理により AE" = 0A"すOE"一2・0A・OEcosの 900 9 121 でMg ーーク2・4・一・一 三 一一 ョはの95 1 AE>0 より 4B=イ 四面体 OADE の体積 必 は 2 cosの 三 三 ター攻略のカギ ! | 空間図形は平面で切り取って三角形に注目せよ | ) 耐を共有する 2つの四面体の体積比は, 辺の長さの比を利用せよ

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この教科書の解説をお願いします。 和訳は平気です。

進化は、 人工知能の怠激な | e。 has become 8 buzzword sg, and recently it has T intehigence 加 49 ned for manツ DOM [ntelsdsnsl Tt has been reseaTC found im variOuS products AI ei | roved. 比 can De , buzzword been greatly im ]eaner8 USG AI to avoia bAzws:7d] 1 robot Yacuurn C ュ greatly greiti For examDplら Smartphones with speech 4 robot [rubal uname cleaning 8 TO0m1・ 。 Yaenum farnitn d spoken questions and 8 understamQd SD [euoml recognition 8yStemS Ca 。cleaner($) how AE can make W hoWw 人るまで Our [kiEnaz(2] commands. These productS Sho 6 recognition Ji [ekagnim ]ives more conVen1ent. 7 command() What contributes most to the prOgreSS 0+ today's ATis [komend(2)] ii brain [brein] <deep learning/. Deep learning 1S a technology that 8各 ij2 ability [sbiltl modeled after the fanctions of the human brain: it has the 陳半 abihity to learn by itself For instance, AT can learn how to recognition 8 SO 2 play a variety of games。 By practicing a lot, it makes | je deep learnini 1 、 の 2 progress Hike human players. Al is now so advanced that直 dd defeated the world champion in go,Which is oneofthemost 『 after て へをも とにして作られる Complex board games. 2 by oneself

真ん中の英文，私は名詞の前にtheをつけましたが答えには何も書いてありませんでした。 theをなぜつかないかおしえてほしいです。

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このふたつの日本語訳を誰か教えてください🙇‍♀️ お手数ですが、お願いします🙏

め EE IロRNNロ| 瑞 Reading = joyed mu Young people have always en]o Sic New they use Websites such 9 ten to their favorite songs. These music videos 因62 YouTube to watch videos when they jis intereSting historY. made by many DOD bands Me き on the 1960s, a 。全As called the Beatles Was VerY popular People al oe er the Beatles could ao Visit al 。 the Sba wanted to see a Beatles Ce HowWev ake 5 videos Which incl nd SW the Hes in the world, so they decided to m of 1 music。 Some people say that this W4S the start of music videos. These ers and on television, and fans of the Beatles coud 胃63 videos were shown in movie theat es. In fact, the Beatles stopped touring in 1966, so these viqeos enjoy their performanCt became the only Way to watch a Beatles perforrnance Tm the 1970s, many music television DrOgrarmS WerC made, and enjoyed by Young oO. These videos Were 10 L 【ア! fns. Often the programs showed a specially created music Vide carefully mnade, and often cost a ]ot of money. mm the 1980s。 24-hour music channels such as MTV started.、 Im 1983, the most fmous music video Was made. It was the video for Michael Jackson's song “Thriller'. It was 14 minutes 1ong, and cost about $500,000 to make. Today, music videos have 中 65 pbecome as important as the muSiC. (217 words) =ョトリレジ ooo でくくでoooeeeoeeeeeeooooeeeeeoeeeeeeoeeeeeeeeeeeoeeeeeeeeeee the Beatles : ビートルズ(イギリスのロックバンド) include : を含む Michael Jackson : マイケル・ジャクソン(米国の歌手) Thriller : スリラー (1983 年にマイケル・ジャクソンが発表したシングル曲)

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を詳んで あとの各間に符え ある いる還・了名には のあとに 【守| 2 次の文 ) x印の付い 8 ra"eap'mean? Whyim thie yearcamed alem mWhatdoes the W leap yegr y knowg there 2016jsal are usually 865 daya in ayear、 365 365 d ut that. The ye8r verybod rat learn abo day of the week Yshifts one day me day. xfell on Wedne 2016 then? Saturday? No eap' and the ye8T which has the leap ja called g ear comes, tho 5 POr yemr? sday in 2014 and on Rday in 20 So when a now y sday 2013, on Thuri [Ria【Sundgy| 時1 ] 呈 1eap year。 Sothie year ia chai ュ 62 weeks and o mas Day are example, Christi What day 8 Christmas Day 反 jump ia aed Jeap ye8r・ ayear which has one *extra day why does this ieap happen? 「EYo four yeare, we have That extra day CaU868 the leap、 The extra day iscalled a ]oap day。 and we have it in February do we hnd a leap yenr? the yegr 好 jiiimible by four that year 9 a leap year。、Ror ample 2016 jadiysible by four soita aleap 79計 [- _@5 How about the year 1900?. not a leap year、 It was a Do you know the reason? Today the Tt *ia based on the *movement of the carth around the 1900 is divisible by four。but i Wa8 Ca KGreg6riam Calendar ia used in many counties around the world」 and it etarted in 1582. the Gregorian calendar, people already knew that one Year jia a Hittle 1onger than 865 Calculated agam and agsinand fnally they found that the earth goes gun。 Before days。 Some scientists And the aun in 365.2422 days。 This means 365 daya and about eix houre. So every year ij about six hours longer than 865 days, and after four year8, the extra time *adds up to 24 hours (one day)。 But there is still some small difierence because each year is a httle shorter than 365 days and six hours8、 TO *make up for the difference, three rules were made. Rule 1: fthe year ig divisible by 4 s a leap year. But we aleo have to follow these two rules. Rule 2: fthe year jg divisible by 100, is a common year Rule 3: f the year ia divigible by 400, 辻 ja a leap year. From the 1 ese three rules, we wl know the years 2000 and 2400 are | (3-a) | years, but 2100, 2200 and 2800 are | (3-b) | yeare. Now you know why the year | 4 Wa a common year. There are dift 0 e と "calendara all over the world。 We can fnd different leaps in them。、 ら ma i ・ に 8 和 eir calendar by using the movements of the sun and the moon。 Their calendgr ren1 ュ ・ *Inatead, they 2 the Gregopan calendar There ia no 1eap day in the Chinese calendar. eap month。 They put gi し 19 monthsinayemrl It goes hike (January rother month mn the calendar, so sometimes there aTG Im Japan, 80 day8. calendar, the od cendarin Edo pen cbruary March Teap March、 Apri May 。 0ne year had 354 da 198 Yag Hike the Chinese calendar。 One month had 29 After three yeara 了 had 11 daye fewer than a common year of the Gregonmm ) erence adde up to 88 days、 Thia im about one month。 0! -6・ ti

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間誠蘭 ルルoomxe 1 分 56 秒を目標に読みなさい。 UDGI2NJTgGWGiGMI BrazihWithiaiBopttatodef18 milhen_asiof.20108 Back in the 1960S, it had various problems that are often seen in big cities throughout the world, such as busy town streets and a lack of green SDace. ての不足 mayor in 1971, succeeded in solving these problems. Lerner carried out a series of big reforme。 But Jaime Lerner, who became First, he changed the city's busiest town street into a pedestrian Zone. Next, he planted flowers and trees, and put benches in parts of the 0 It became a popular meeting place for people. Although local Shopkeepers thought these changes would hurt business, they soon found out that actually fe were able to make more profit. After thiS success、Lerner tried to solve the problem of public transportation. He connected some buses together so that they could hold more people at a tme. Thanks to tm there were no more traffic Jas during rush hour. _He ・ Je to make EEこ By changing a number of river areas into parks, he crwel Jot t more mee Space in the city. He also started to educate people on how to

All the actors we interviewed today had been trained in modern dance since childhood. 上の文で使われているinはどのような意味でしょうか？

名古屋市無形民族文化財とはなんなのでしょうか？