よっての所のs＝2△abdのabdがなぜくるのですか？ 優しい方詳しく説明教えてください

基本例題159 図形の分割と面積 (1) 次のような四角形ABCD の面積Sを求めよ。 8日 平行四辺形ABCD で, 対角線の交点を0とすると (1) AC=10, BD=6√2,∠AOD=135° (2) AD//BC の台形 ABCD で, AB=5,BC=8, BD=7,∠A=120° 指針 四角形の面積を求める問題は, 対角線で2つの三角形に分割して考える。 (1) 平行四辺形は,対角線で合同な2つの三角形に分割されるから S=2△ABD また, BO=DO から △ABD = 2AOAD よって, まず △OADの面積を求める。 (2) 台形の面積=(上底+下底)×高さ÷2 が使えるように, 未知の量である上底ADの 長さと高さを求める。 まず, △ABD (2辺と1角が既知) において余弦定理を適用。 CHART 四角形の問題 対角線で2つの三角形に分割 解答 (1) 平行四辺形の対角線は, 互いに他を2等分するから A=1/AC=5, OD= D=1/2BD=3√2 A 合 したがって AOAD= OA-OD sin 135° 15 2 AD²+5AD-24-0 (AD-3)(AD+8)=0 135° ゆえに よって AD > 0 であるから AD=3 頂点Aから辺BCに垂線 AHを引くと AJOX ) △ABD において, 余弦定理により 72=52+AD²-2・5・AD cos 120°割する120% 5 7 B = 1/2.5-3√/2 √/2= 1つにしちゃ よって S=2△ABD=2･2△OAD=4.15=30X[練習 159 (2)参照] pbe 42 S=AC-BD sin B H D p.245 基本事項 2. 基本 158 (RA+I) Danis AH = ABsin∠B, ∠B=180°∠A=60° CELE 851 8 527 S=²(AD+BC)AH=(3+8).5 sin 60°= C (*) △OAB と △OAD は, それぞれの底辺をOB, OD とみると, OB=OD で, 高さ が同じであるから、その面積 も等しい｡ [参考] 下の図の平行四辺形の 面積Sは 55√3 4 247 B | AD // BC C (上底+下底)×高さ÷2

答えがないので教えて頂きたいです🙏🏻💧

第3回 078 079 080 ① 空所に入れるのに最も適当な語句を,下の①~ ④ から一つずつ選びなさい。 We will be arriving at Chubu International Airport ( ) 10 minutes. . 2 during by 3 for 4 in 076 077 071 072 073 074 075 Level 1 - PART C = The population of this city increased ( 1 of 2 at 3 by She was ill in bed. That's ( 1 because 2 why "You are going to take next week off, aren't you?" "Yes. ( ) my absence, I would like you to take over from me." 1 On 2 For 3 While 4 During ) three percer last year. 4 in He behaved as ( though ) she didn't come to the party. 3 what 4 when A book is not always good just ( 1 because 2 when When I got to the checkout counter, I realized that I didn't have enough money, so I kept ( ) I really needed and left the rest. 1 that 2 this 3 what ( ) you were not at the meeting, we made the decision without you. 1 Unless 2 Since 3 If ) nothing had happened. 2 soon as 3 for For The number of students in my reading class ( 1 is (2) are have (名古屋外語大) (南山大) (大) 4 which (センター試験) ) it is written by a famous writer. 3 while 4 as (4) to (高岡法大) ( ) her kind advice, he succeeded in passing the examination. 1 In case of Far from On earth 4 Thanks to (京都学園大) (東海大) (創価大) (中央大) ) limited to twenty-five. 4 has (専修大)

かっこに当てはまるaで始まる単語を教えてください🙏

Geoffrey's doctor advised him to ( foods in order to lower his cholesterol. ) from eating fatty

高校2年生です。 4番と６番の問題を並び替えて欲しいです!!!

リサはお母さんに昼食を作ってもらった。 (アhad ハイ make /ウlunch / Ⅰ Lisa / オher mother). to t 5. そのネコは毎日リサによって世話される。 The cat (ア taken ノイ by /ウ care / エ is / オ of) Lisa every day. 6. あなたは今日、学校を休むべきではなかった。 ( 1語不要) Dret You (アhave/イ should ノウ absent/工 ought / オbeen / カto / キ not) from school today. 216 アウキ

(2)にはbeingが入るのですがなんでそうなののかがわかりません。周辺の文構造も一緒に解説していただけるとありがたいです

(1) Considerable attention has been paid to the size or relative size of the human brain. The first point of interest is that the ratio of brain weight to body is at a maximum at birth and decreases with age, reaching a fairly steady level by maturity. In other 5 words, newborn babies have very large brains, relatively speaking, weighing some 300 grams. This is roughly the size of the brain of an adult male chimpanzee. Children and their brains continue to grow for many years, gradually increasing their ability to learn and remember. There have been suggestions that the growth of 10 the brains of children is not steady, but occurs suddenly, each period of rapid growth (2) associated with a particularly important developmental or intellectual stage. These stages could be the ability to reason abstractly, to talk, or even to do arithmetic. The idea of sudden brain growth is still around, but 15 has not attracted much enthusiasm. Some research has shown differences in the relative sizes of the brains of males and females of the same age, but so far no great differences have been found between people of the same age but of different ethnic groups. Obviously the brain of a small Japanese teenager is very much smaller than that of a giant Russian boy. But when brain size is adjusted for size or weight of the body, there ( 3 ) great advantage for either with respect to intelligence. Moreover, in measuring intelligence one has, of course, to take into account the effects of education and cultural background. Individual brain sizes, particularly of famous people, have also

このwouldはどういう意味のwouldですか？

Opinion Writing 次の質問への回答を, 英語で自由に書いてみましょう. Q: 地球温暖化を防ぐため、 自分ならどんな方法でみんなの行動を変える?その理由は? A : I would ( It is because ( (abrow 8ED)W.noitettogams nolas

質問です これの答えが 2番shouldではなく4番oughtになるのはnotの後ろにtoがあるからですか？

52 888 I( 6bfidy ) not to tell my father the true state of his health. svloved \ ob taum =) ka +1 1 must 3 better 2 should 4 ought van 'nob (S) ob [f'abson]ion been =) (4) **** 1 ob of ever lliw 〈福

11. 答えは②なのですが なぜ意味上の主語がfor himではなくof himなんですか？ 教えてください🙇‍♀️

▷9. The ( X literacy X 10. The two businessmen negotiated for the benefit of their ( 1 different 2 individual 3 respective 4 X ) meaning of "television" is seeing from a distance. U 2 literal 3 literary 4 literate 11. It was very ( 1 sense X. 12. They finally succeeded in catching the tiger ( S 1 alive live 3 lively 13. Oxygen is ( 1 absent ) of him not to buy such a cheap model.]. 2 sensible (3) sensitive ) in blood. 2 certain ) compar separate present 4 sensual 4 living sure

英語の読解問題です。 これで合っていますか？

Answer the following five questions. Instruction Manual Thank you very much for purchasing the TAC-K e-book reader, which was released in November. We hope you get many years of enjoyment out of our product. Before using the reader, please go over this instruction manual in order to ensure its proper use. yeud saltan m'obstay attel bigl ilhote and FAIT 76 sad nezgo LA C fid Cautions in handling vnos duodi portuqut bas rounde er bezaland, Jab MONT The battery pack has a limited lifetime. Although it differs depending on usage and conditions, when the charge becomes noticeably shorter even after properly charging the battery, it is time to replace the battery pack with a new one. It will cost 15 dollars. boog slut disappointing nda Jand si ILA Troubleshooting (FAQ) ● It gets hot while charging. ⇒It is normal for a terminal or a battery pack to get warm while operating or charging. This is absolutely safe, so please continue using. ssed at a meeting Shehore vidssoiton asmoced bination (Sbw ad='cout (a) Dear Casey, It's been a long time. How are you doing? It's already been half a year since you left our school and went to Paris to study painting. I expect you're doing well in Paris since you're fluent in French. (6) bisnod 1) Well, I think I wrote in my previous letter that my TAC-K e-reader got hot while charging. However, the instruction manual advised me not to worry about it; the same advice you gave me earlier. That was a relief! toga. Although I bought my TAC-K two months after its release, two years have passed since then, and the battery life is now extremely short even after properly charging it. I'm wondering whether I should buy the newer TAC-M model. Besides having a better battery, it also has a voice search function. Sincerely yours, Donald Disne yeaso W 21 What would you do? I'm interested in your opinion because you're familiar with electronic products.devia seriou at wi Isb GROCENTES Frase netter

高校1年の英語の問題です。答えがmust have beenになっているのですが、must has beenではないのですか？わかる方、是非教えて頂きたいです🙇‍♀️！

日本語の意味になるように、空所に入る適切な語を答えなさい。 )( 1) Since he was absent from the meeting, George ( )( )sick then. 会議を欠席したので, ジョージは具合が悪かったに違いない。 ・