なぜ、答えが AC＝4cm になるのか教えてほしいです🙇‍♀️

(2) 右の図で, ∠BAD=∠CAD, AB=6cm、 BD = 4.5cm, CD=3cmのとき, ACの長さを求めなさい。 円の B D

何時間も考えましたが一向に分かりません。 教えていただけると嬉しいです。

110 2014 年度 数学 4 半径rの円P と半径1の円Qの二つの円がある。円Qは円Pの円周上の点Aと 信州大-理・医・繊維 〈後期〉 その中心を通る。 また, 円Qには一辺の長さがαの正三角形ABCが内接している。 円Qの弧 BC上に新たに点Dをとるとき, <CAD =0として次の (1) (4) の 問いに答えよ。 ただし, 0°<0 <60°とする。 (1) 三角形ACDの面積をaと0を用いて表せ。 (2) 三角形BCDの面積をaと0を用いて表せ。 (3) 三角形ACDと三角形BCDの面積の和が最大となるときの母を求めよ。 (4) 円Pに内接する正三角形AEF について考える。 円P の弧EF上に新たに 点Gをとるとき, 三角形AFGと三角形EFGの面積の和の最大値を求めよ。 ただし, 0°<<FAG < 60° とする。

大門5の2番合ってますか？ 教えてください🙇‍♀️

ig Point マイン・カフォンと は何ですか。 エクトコ Look at this picture. Can you imagine what the device for clearing landmines. It is made of an iron ball object is? It is Mine Kafon, a wind-powered Rolling along the ground, it and bamboo legs. 5 steps on a landmine and explodes it. Even today, there are about 110 million landmines in the world. Every 22 minutes, one person is injured or killed by Many of the victims are ordinary This device is expected to reduce the landmines. people. number of landmines in the world. Mine Kafon made of? landmines are there in the world today? Massoud Hassani, a designer, wanted to solve landmine problems with the power of design. He was born in Afghanistan in 1983. At that time, there were several wars going on there. Massoud and his family lived in an area surrounded by landmines. as a child, Massoud made all his toys Living there by hand. His favorite toys were paper-made objects that were rolled by wind power. Because his toys often landed in areas with landmines, he could not get them back. Questions AMI PERHE designe des di A マスードさ のころに ちゃを Where and when was Massoud borm 2 What did Massoud make by hand

大門2合ってるか確認して欲しいです お願いします

ig Point マイン・カフォンと は何ですか。 エクトコ Look at this picture. Can you imagine what the device for clearing landmines. It is made of an iron ball object is? It is Mine Kafon, a wind-powered Rolling along the ground, it and bamboo legs. 5 steps on a landmine and explodes it. Even today, there are about 110 million landmines in the world. Every 22 minutes, one person is injured or killed by Many of the victims are ordinary This device is expected to reduce the landmines. people. number of landmines in the world. Mine Kafon made of? landmines are there in the world today? Massoud Hassani, a designer, wanted to solve landmine problems with the power of design. He was born in Afghanistan in 1983. At that time, there were several wars going on there. Massoud and his family lived in an area surrounded by landmines. as a child, Massoud made all his toys Living there by hand. His favorite toys were paper-made objects that were rolled by wind power. Because his toys often landed in areas with landmines, he could not get them back. Questions AMI PERHE designe des di A マスードさ のころに ちゃを Where and when was Massoud borm 2 What did Massoud make by hand

この文章の4行目にある、because they would harm whatever bacterial life forms might be present on the planet の文構造についてなのですが、might の前にあるはずの関係代名詞の主格whi... 続きを読む

次の文章を読んで、 問1~4に答えなさい。 The establishment of a colony on Mars has been a dream for decades. Inevitably some people have objected to the idea of colonizing Mars on both ideological and practical grounds. Some object to humans living on Mars because they would harm whatever bacterial life forms might be present on the planet. Others oppose Mars settlements because they disagree with the idea of using the Red Planet as a "backup" in case the Earth is destroyed. Those in favor of colonizing Mars, however, look to spread the human race beyond our single planet. The practical considerations of surviving long term on a world without a breathable atmosphere, no surface water, exposure to radiation, and extremes of heat and cold all have to be addressed first. Mars colonists could survive in domed cities, extracting and recycling resources from the Martian environment. However, a more interesting plan for the settlement of the Red Planet involves a process called terraforming, turning the dangerous environ- ment of Mars into something resembling Earth. Billions of years ago, Mars was more like Earth, with a thick atmosphere as well as oceans and rivers of surface water. The planet may well have had complex life forms. However, sometime in the distant past, Mars lost its (A ). When Mars found itself without the protection of that field, solar wind relentlessly stripped it of its atmosphere, quickly turning the planet into the frozen desert it currently is. While a number of schemes exist to restore Mars' atmosphere, creating a runaway greenhouse process that would raise its temperature, NASA and some academic researchers recently came up with a simple way to achieve the process naturally. The idea involves the creation of an electromagnetic shield between Mars and the Sun to protect the Red Planet from solar wind. Without the solar wind stripping it away, the atmosphere of Mars would gradually become thicker. Soon the temperature on the Martian surface would become high enough to release the trapped ( B ) at the poles, accelerating the (C). Water ice at the poles would melt, giving Mars back some measure of its oceans and rivers. All humans would have to do is introduce

(1)〜(4)まで全て分かりません🥲教えてくれると嬉しいです！

for Expression Writing [文章の誤りを直す] /16 (4点) 8 Answer the following questions. 次の文章は、あるアメリカの高校のウェブサイトにある学校紹介ですが､ 文法や内容に誤りが あるようです。 下線部 (1)~(4) の誤りを直し、 下線部全体を記述しなさい。 Star High School (1) has been one of the best school in San Francisco for the past 20 years. It is known as a school with quality teaching and various school events. Our school provides (2) as few as 20 school activities in the three academic years and has over 10 societies and clubs. We welcome students from all cultural backgrounds. (3) Since the school have started in 1998, our students have come from different towns in the San Francisco area and neighboring cities, (4) or they are all interested in the differences and uniqueness they find on campus.

この英文のどこに同様という訳の語があるのですか？

Almost since the first days of European settlement, South Carolina has been rice country. Rice was once to South Carolina what tobacco was to Virginia and cotton was to Texas. Car Vinkini (神田外語大)

解答の3行目まででの質問ですが、r≠1を確認する時との違いは何ですか？

考え方 [Check] 例題292 分数型の漸化式 (1) 解 OF CO Focus a=- 1 2 で定義される数列{an}の一般項an を求めよ. SSD OPTID 9 an の逆数 India ( 3700 これまでに学んだ漸化式の解法が利用できないか考える ここ では,漸化式の両辺の逆数をとって考える. 1 - を 6, とおくと、与えられた漸化式は,例題285 an (p.505) のタイプ (an+1=pan+q) となる. An an+₁=₂an_) (s) +=+ 2-an an+1=0 と仮定すると, an=0 これをくり返すと, An-1=an-2 =......=a₁=0 となり, 4=1/12/30 と矛盾するので, ≠0 ここで,(bm= よって, 与えられた漸化式の両辺の逆数をとると 1 2-an 2 ・1 an+1 an an 1 an 3 漸化式と数学的帰納法 *** = とおくと, an= = 1 2-1+1 an 0 (n ≥1) SINCE+an+1 = 1 bn+1-1=2(6n-1),b1-1=1 したがって, 数列{bn-1} は初項1,公比2の等比数列だから、 bn-1=1・2n-1 より, \bn=2n-1+1 6n+1=26-1,61= -=2 a 逆数 OVE となり,n=k+1 のときも成り立つ. よって、すべてのnに対して, an=0 が成り立つ. (南山大) (2014 &+8+8= (- a1 1歳8 + spail it? an 2-an an=0 -=0 トキ」を確認するときとの α=2α-1 より, α=1 An stato stansiy 1=27-1+1 より, an=2n-1+1 分数型の漸化式は逆数で考える 13233) 48ð 注例題292 で an=0 は, これから学ぶ数学的帰納法 (p.532〜) を用いた証明もでき Sant 3·0⁰ る. RITIDS <a≠0 の数学的帰納法による証明 > Cadd n=1のとき, a1=- ≠0 +0¹ 26832203_²5/S5/ESKAO3**# 53* =kのとき, αk=0 と仮定すると, n=k+1 のとき, ak+1= AT 513 ak 2-ak Cas 33 まし 治温室また。分数型の漸化式は,例題292のように逆数を考える方法だけでなく,例題 D 293 (p.516) のように特性方程式を利用する解き方もある。 E

図形の証明問題です.' 三角形の合同は求められたのですが、この後どうすれば良いのか分からないので教えて頂きたいです. お願いします ( ¯¯ )ง🔥

166 D A ・60° □△ACDと△ABEが合同 → 結論 ACⅡIEBに持っていく (証明) C △ACDと△AEBにおいて、 △ABCは正三角形なので、 60° AC = A B !!! △ADEは正三角形なので、 AD=AE LCAD= LEAB △ADEも△ABCも正三角形 なので、 ∠BAC=∠EAD=60°.... ③ CBAC-LBAD"④ =LEAD-LBAD… ⑤ ⑤より、 <CAD= LEAB ... ⑥ こ より、2組の辺と その間の角がそれぞれ等しいの で、 △ACD=△AEB 合同な図形では対応する角の 大きさは等しいので、 プを閉めてください。 保管は避けてください。 した後、インクの色が薄く残る場合があります。 ボ 30

英語の質問です。 King Charles Ⅲ was anointed and crowned May 6 in Britain’s biggest ceremonial event for seven decades, a display of *pomp and... 続きを読む