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数学 中学生

(3)がわかりません。至急なのでどなたかお願いします!💦 模範解答は納得はできたんですが、△AQPの面積求めて…ってやってはできないんですか?

6 右の図のように、三角錐 ABCDが あり,AB=2√7cm, 6 (1) BC=BD=6cm,CD=2cm, ∠ABC=∠ABD=90°です。 点Pは B 頂点Aを出発し, 辺AC上を毎秒 D 面積 (2) 1cmの速さで頂点Aから頂点Cま で移動します。 体積 cm³ 8秒 √35cm2 14/5 32点(各8点) 3 (京都府) 48 □(1) 点Pが頂点Aを出発してから頂点Cに到着するま (3) 秒後 7 でにかかる時間は何秒か求めなさい。 AC2=(2√7)2+62=64 AC=8cm 毎秒1cmの速さで進むから, 8秒かかる。 □(2) △BCDの面積を求めなさい。 また, 三角錐 ABCD の体積を求めなさい。 三角錐 ABCDの体積は, -x√35 ×2√7= 右の図で,BH2 = 62-12=35 BH=/35cm ABCD=122×2 -14/5 (cm3) =122×2×√35=√35(cm²) 6 6 3 (3)Qは,頂点Aを点Pと同時に出発し,辺AB上 を頂点Bに向かって, BC//QPが成り立つように進 みます。 三角錐 AQPDの体積が 24√5 7 cm3となるの は,PがAを出発してから何秒後か求めなさい。 三角錐 ABCD と三角錐AQPD は, それぞれ底面を△ABC, AQP とみると 高さは等しいから、体積の比は,△ABCと△AQP の面積の比に等しい。 (三角錐 ABCD の体積):(三角錐 AQPDの体積)=145:24,5 -=49:36 だから,Q △ABC: △AQP=49:36 ....① また,BC//QPから△ABC∽△AQPで,その相似比は①から,7:6 よって, AC: AP= 7:6 8:AP = 7:6 7AP=48 CTHD B 6 AP = 48 cm よって、48秒後

未解決 回答数: 2
英語 中学生

写真の問題より、(3 )に入る言葉の模範解答がbigger,largerだったのですが私はmoreとかきました。moreだとバツにたりますかね?

Tony: What are you going to make a presentation about? Riku I'm going to introduce my idea for a new park. Here is a graph showing "Roles which people want for parks." I think parks serve many important roles. I want to make a wonderful new park in my town in the future. Tony: Great! Riku What is the most important role for parks for you? Tony: Well, I think "A place for eating" is the most important. Riku: I think that is important too. But its percentage is the lowest in this graph. Roles which people want for parks A hub for the community A place for exercise and sports A place for children to play A place for relaxing A place for eating 0% 10% 20% 30% 40% Tony Interesting. In my country, I often enjoy eating lunch in a park. Riku: I think "A place for children to play" is the most important. Many other people also want that role. Tony Yes. Its percentage is a little lower than that of "A place for exercise and sports" and "A hub for the community." But it's higher than the percentage for the other roles. Riku Parks can play a lot of roles in a town. I'll try to make a park that serves important roles. There are many possible roles for a park in a town. I hope people find good roles for my park. Tony: Great! I think your presentation will be really interesting. I want to know more about parks and towns. hub +0 <要約文> Riku is going to introduce his idea. He and Tony look at a graph that shows some (1) which people want for parks. As for the (2) important role for parks, Riku thinks it is "A place for children to play," but Tony thinks it is "A place for eating." According to the graph, the percentage of Riku's opinion is (③) than Tony's. Riku hopes to make a park that plays important roles.

解決済み 回答数: 1