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数学 中学生

めんどくさい問題ですがお願いします🤲 指差してるところの式でなぜADが分かるのでしょうか?

AD-cmn 『2 3:5 m であ 10 6 Ho AABCの画はよ×6 であ る。また。点Aから辺BCに下ろした線と 辺BCとの交点を目とするとき。 AABC おいいて、言平方の定理から BC-AB+AC -6+8 r-90-3 -51" シツ AOC -2BDC =vとすると、2 BOC- 2yとおける。 よって、y+2y=180より, y-60" したがって、AAOC は正三角形となる。 狐ADに対する円周角は等しいから。 CACD= ZABD=34° したがって、ォ=60°-34°= 26" (a) 1 24 のKY CBDC=r- -52(BAC -ノ うに。 576 BL U辺 AB上に点 52 う:2 え:6 25 下の図のょ -100 /74 BC- 10 C6 (2) AG:GCを聞 チ×10×AH-24より。 ン北海道 25 40° AH= い。 cm E AABH において, 三平方に定理から F (b) 3 BH=6- p33 56 BH=V9X- であ 48° 102 =4 B 25 解 72°× 40° BH>0より. BH= cm (3) AL 48° 解 Zr=90°- 42° =48° 92° 解 ZEBO =40°+2=20°である。 また、ZCOD= 36°× 2 = 72°より, ZBOD= 180°- 40°-72°=68°である。 よって、ZCED=ZOEB=180°-20°一68°=92° ACPE と△QDE で、 10B AD=10-2×- cm 109 AABC において、三平方の定理から C=6°+8 BC=V100 BC>0より、. BC=10 仮定より,FC=10×g-2 2 -=4cm ここで、AABC と△FGCについて, ZBAC= ZGFC=90° ZACB= ZFCG より, 2組の角がそれぞれ の等しいので、△ABC 3△FGC であるから。 105 共通な角より, ZCEP= QED………① ZABP= ZCAD3 90°よ り ZAPB= 90°-ZPAB 2OAD= 90°- ZCAO= 90°-ZPAB よって,ZAPB= ZOAD…② AOAD は二等辺三角形より, 2OAD= ZODA………③ 対頂角は等しいから, ZODA=2QDE……④ 2,3,のより,LCPE= ZQDE……6 の,6より,2組の角がそれぞれ等しいから, ACPE のAQDE CG= ×10=5cm IG=8-5=3cm よって, AG:GC=3:5 AADE とA CBE において, AD/BC よ 請覚は等しいから, ZADE=L CBE. 適分 AC上に点GをZBFG=90°となるようにと DAE= ZBCE てAADE のA CBE であり, 相似比は 「の 10=7:25 である。 108 | (1) (a) ウ (b) カ D を用いると。 6 (c) AEAD と△EFB で, ④より ZAOD= ZBOD………5 1つの弧に対する円周角は, その弧に対する中心 (cm), BC FGC より 角の半分であるから。 A BC ニつu0 10 ZAED= ZAOD…6 Cm 辺 BC 上に点Eが. = LBCD= 40と ZAFC-115°のとき、の大きさを求めなさ あり,==, AC=8cm, =90°℃ 97 下の図のように, AD/ BC の台形 が 辺BC上に点Fを, BF:FC3:2とにと

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英語 中学生

長文です。答えはイ何ですが、その根拠となるところがわかりません。

(*印の付いている単語·語句には, 本文のあとに [注] がある。) There are many museums and *theme parks around Tokyo. Some of them teach people about the history of Japan, like *Edo Wonderland in Nikko and the "Edo-Tokyo Museum in Ryogoku. They are popular places for school trips because students can enjoy learning about Japanese history. I remember one of my school trips. When I was a student in Australia, we went on a school trip to Old Sydney Town. It was a theme park that *recreated the *past, just nke Edo Wonderland in Nikko. Old Svdnev Town was an hour away from Sydney Dy bus. 1t had more than 30 buildings. They were made in the same 'style as buildings in 1803. Many *actors were working at the theme park. They *wore old-style clothes, spoke old-style English, and "pretended to live in the town. “Horse-drawn wagons went up and down the streets. upin My friends and I were excited to see the actors' "performances. People drank at a "pub, sang old songs and danced in the streets. Some of them pretended to “fight a duel Some museum “staff gave us short history lessons, and we enjoyed listening to them very much. I remember Old Sydney Town was very exciting, because it brought us to another world. Old Sydney Town closed about 30 years after it opened. Many people visited there at first, but the number of people visiting there "gradually went down. The buildings started to become old. and more and more actors left Old Sydney Town. There were a lot of people who enjoyed visiting Old Sydney Town when they were children. And later, they took their own children there, but they said it was not as exciting as before. Why did Old Sydney Town close? There are many different "opinions about it. Some people say young people now like to play video games, and these young people think that a trip through time is not very exciting. Other people believe that Old Sydney Town did not *attract many people because it could not make new and exciting *entertainment. Times change and people also change. New "technology and the Internet can make new kinds of entertainment, and people can enjoy them at home. New building *materials can now make buildings that look like something from the future. New technology will make us more surprised. But it is also very important for us to keep old culture and entertainment. Maybe some of these things are not seen in everyday life, but they make a "link with the past. For example, if you go to see kabuki, maybe you will think about Japanese people who lived in the past. Culture *is made up of all the things people did in the past, and it makesa country and its people "unique. If we forget about the past, then we lose our culture. 10

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