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数学 高校生

(1)でA=180°−Cはできないんですか? なぜ、この参考書でC=180°−Aと求めているんですか?

252 基本 例題 163 円に内接する四角形の面積(2) (1) cos A の値を求めよ。 円に内接する四角形ABCDがある。 AB=4, BC-5,CD=74=10のときのた 指針 四角形の問題は、対角線で2つの三角形に分割するのが基本方針。 また、円に内接する四角形の場合, 対角の和は180° であることにも注意。 (1) △ABD, ABCD それぞれで余弦定理を適用し, BD2を2通りに表す。 A=180-C(2) Very 【CHART 四角形の問題 ①1 対角線で2つの三角形に分割 なお, A+C=180° (対角の和は180°) も利用。 △ABD+△BCD として求める。 △ABD, ABCD の2辺は与えられているから,そ の間の角の sin がわかれば面積が求められる。 (1) の結果を sin? A+cos' A=1に代入 しまずsin A を求める。 事項 ※円に また の関 の (2)四角形 ABCDの面積を求めよ。 基本162 参考 COSAを求めら 1. F 円 ② 円に内接なら (対角の和)=180°に注意 [解 解答 (1) 四角形ABCD は円に内接するから 189-A △ABD において, 余弦定理により BD2=102+42-2・10・4cos A =116-80cos A ... ① ABCD において, 余弦定理により BD2=72+52-2・7・5cos (180°-A) B A 15 10 180 A 7 D 116-80cos A=74+70cos A =74+70cos A ...... ! ① ② から 42 ゆえに cos A= 7 150 25 (2) sinA>0であるから sinA= 25 1 (2/6)= ¥576 24 25 25 また 24 25 よって, 求める面積は sinC=sin(180°-A)=sinA= A+C=180° 補助的をろしい cos(180°-A)=-cos A ① ② から BD2 を消去。 検討 本例題のように,円に内接す 四角形の4辺の長さが与え られているとき∠AC の正弦の値をそれぞれ求め、 △ABD と ABCD の面積を 求めることができる。 このようにして,一般に,円 に内接する四角形は、4辺の △ABD+ △BCD= 12. ABAD sin A+ 1/2 BC・CD sinC 長さが決まれば、その面積が = ・4・10・ -1214-10-2+1/2-5-72-36 やわくてもO 決まる (次ページの1.参照)。

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英語 高校生

教えてください🙇🏻‍♀️

[2] あるクラスでディベートが行われています。 (1)~(3)はディベートの前半戦, (4)(5)は後半戦における発言の (1) 一部です。 ディベートの流れを意識しながら, 進行役の先生のセリフ が流れよく成り立つよう、下線に当てはまるものを選択肢から選び, 記号で答えなさい。 [思・判・表] (2) (教科書 P.88~89, P.92~95 参照) (3) (1) Teacher Are you ready to start our class debate? (4) Our topic is here on the board: "Digital books are better than paper books." (5) Raise your hand if you have a reason to support for this statement. (2) Student A: With an eReader, we have access to all of the books that we own. We can read many on the train. We can't carry many books with us every day. Teacher: (3) Student B Paper books don't use electricity. It's important that we use as little electricity as possible to prevent global warming. Teacher: (5点x5) (4) Teacher: Next, we will refute the other side's opinions. Say which opinion you are refuting, give your refutation, then give an example. (5) Student C They said that digital books are convenient, but I don't think it's a big advantage. We don't always need all of our books with us. Just one book is enough. Teacher: [選択肢] J. Good idea. "Good for the environment." 5. Great. "Digital books are convenient." 1. Let's start with the affirmative side. I. Very good. "Not a significant advantage." *. Let's start with the negative side.

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英語 高校生

あってますか

" 8.日本語に合うように、空所に適切な英語を入れなさい。 (1) この店ではりんごはみかんより人気があります。 Apples are mare Popular than (2) 東京スカイツリーは日本で最も高い建物です。 the highest Tokyo Skytree is (3) 兄は私よりもたくさんの本を持っています。 My older brother has more books most beautiful (4) これは5つの中で最も美しい絵です 。 This is the oranges in this shop. building in Japan. than I do. painting of the five. 9-1. 次の日本語に合うように,( )に適切な英語を入れなさい。 (1) 私たちの教室は毎日そうじされます。 Our classroom ( is (2) このいすは木で作られています。 This chair ( )( cleaned ) every day. made ) ( of ) wood. (fregsuawttg) (3)これら2つの部屋はあまり使われないです。 These two rooms (aven't much. )(ofler 9-2( )内の英語を適切な形に変えなさい。(ただし, 1語になるとは限らな (1) I am (old) than my sister. older good (2). Your room is (big) than mine. bigger (3) This question was (difficult) than the others. more difficult 9.3例にならって,各単語を比較級と最上級にしよう。 (例1) long (longer) (longest) - (2) beautiful - (more beautiful) - (most beautiful) colder 1) cold - ( 2) safe - ( Safer )-( coldest ) )-( Safest )(happiest ) )-( biggest ) )-( best 3) happy (happier 4) big - ( bigger 5) good - (better 6) many/much - ( more 7) difficult - (more difficult 8) exciting (more exciting )-(most) )-(most difficult ) )-(most exciting)

未解決 回答数: 1
英語 高校生

赤い下線のところがどういう構造になっているか分からないです、教えてくださいm(_ _)m

moving from " (1) 点) There are historians and others who would like to make a neat division between "historical facts" and "values." The trouble is that values even enter into deciding what count as facts-there is a big leap involved in 'raw data" to a judgement of fact. More important, one finds that the more complex and multi-levelled the history is, and the more important the issues it raises for today, the less it is possible to sustain a fact-value division. But this by no means implies that there has simply to be a conflict of prejudices and biases, as the data are manipulated to suit one worldview or another. What it does mean is that the self of the historian is an important factor. The historian is shaped by experiences, contexts, norms, values, and beliefs. When dealing with history, especially the sort of history that is of most significance in philosophy, that shaping is bound to be relevant. As far as possible it needs to be articulated and open to discussion. The best historians are well aware of this. They are alert to many dimensions of bias and to the endless (and therefore endlessly discussable) significance of their own horizons and presuppositions. A great deal can of course be learned from those who do not share our presuppositions. Our capacity to make wise, well-supported judgements in matters of historical fact and significance can only be formed over years of discussion with others, many of whom have very different horizons from our own. It is possible to I have a 12-year-old chess champion or mathematical or musical genius, but it is unimaginable that the world's greatest expert on Socrates could be that age. The difficulty is not just one of the time to assimilate information; it is (2)

解決済み 回答数: 1