Grade

Type of questions

Mathematics Senior High

分からないので教えて頂きたいです!

10AABCにおいて辺BC, CA,ABの長さをそれぞれ a,6,c とし, ZCAB, ZABC, Z BCAの大きさをそれぞれ A,B,C とする。 太郎さん、花子さんは△ABCについて余弦定理 a?: ア を習い、その理由について考察した。 ZAが直角のとき ZA=90° であるから、 三平方の定理が成り立つ。 斜辺の長さがaなので α'=b?+c2 となる。 I cos A=0 であるから、(*) は成り立つ。 A B LAが鋭角のとき 太郎さんの証明の構想 頂点Cから辺に垂線 CH を引いてできる 2つの直角三角形で考える。 ACBHにおいて三平方の定理より BC=CH?+BH? (あ) また、CH= BH=c- II イ A C H B ウ これらを(あ)に代入して(*)は証明できる。 LAが鈍角のとき 花子さんの証明の構想 図のように頂点Cから直線ABに垂線を引き,その垂線と直 線の交点をHとする。 ACBHにおいて三平方の定理より BC=CH?+BH*… (い) I また。 CH= bsin ZCAH= エ H A B BH= AB+AH =c+bcos オ =C- ウ これらを(い)に代入することで (*) が証明できる。 空欄アには適する余弦定理の右辺を記述せよ。また空欄イ~オに 当てはまるものを下の解答群から選び、 数字①~®を記入せよ。 ただし、同じものを繰り返し選んでもよい。 解答群 D atan B 6 ccos A ③ bsin A の asinC 8 acosC 2 acos B の bcos A ⑤ csinA ctan B 0 ctan A BC O(180°-A) 【⑤ (180°-B) (180°-C) (A-90°) ® (90°ーB) ④(90°-C) D A 2 B

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English Senior High

英語に自信がある人回答づくりお願いします! ※書き込みは気にしないでください。 これプラス、問題に続きがあって、 問5 本文には、実物の動物を見ることによって人々がより深く理解できることが3つ書かれています。それらを日本語で答えなさい。 問6 本文には、動物園... Read More

第4問 次の英文を読んで、 設問に答えなさい。①~6は段落番号です。 黒体 6) のIn my view, (1)it_is perfectly possible for many species of animals living in gon.. ie parks to have a quality of life as high as, or higher than, in the wild. 'Animals in ood z0os get a varied and high-quality diet with all the supplements required. and anv 1pesses they might have will be treated.Their movement might be somewhat restricted. mt they have a safe environment in which to live, and they are spared bullying and social 神年 predators*2 or the irritation and pain of parasites or injuries. The average captive animal racism*1 by others of their kind. They do not suffer from the threat or stress of will have a greater life expectancy compared with its wild counterpart, and will not die of drought, of starvation or in the jaws of a predator. Alot of very nasty things happen to truly wild' animals that simply don't happen in good zoos, and to view a life that is 'free' as 術保者一 one that is automatically ‘good' is, I think, an error. Furthermore, zoos serve several key purposes. の Firstly, zoos aid conservation. Colossal numbers of species are becoming extinct across the world, and many more are increasingly threatened and therefore risk extinction. Moreover, some of these collapses have been sudden, dramatic and unexpected, or were simply discovered very late in the day. Aspecies protected in captivity can be bred up to provide a reservoir*3 population against a population crash or extinction in the wild. A good number of species only exist in captivity, with many ofthese livinginzoos. Stillmore only exist in the wildbecause they have been reintroduced from zoos, or have wild populations that have been1o0osted by captive bred animals Without (2these efforts there would be fewer species alive today. Although reintroduction successes are few and far between*4, the numbers are increasing, and the very fact that species have been saved or reintroduced as a result of captive breeding proves the value of such initiatives. ③ Zoos alsoprovide education. Many children and adults, especially those in cities, will never see a wild animal beyond a fox or pigeon. While it is true that television documentaries are becoming ever more detailed and impressive, and many natural history specimens are on display in museums, there really is nothing to compare with seeinga living creature in the flesh*5, hearing it, smelling it, watching what it does and having the time to absorb details. That alone will bring a greater understanding and perspective to many, and hopefully give them a greater appreciation for wildlife, conservation efforts and how they can contribute. ④ Inaddition to this, there isalsothe education that cantake place in Z0Osthrough signs, talks and presentations which directly communicate information to visitors about the animals they are seeing and their place in the world. This was an area where zoos used to be lacking, but they are now increasingly sophisticated in their communication and 8.

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