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English Senior High

なぜ④はだめなのですか? セ 2020

5文章の左にある(])、 lm人/まが なお, 交 に答えよ< っ(A・B)に のを読み 軸 奄点 39 入間gののをし ⑥Mはパラ ey roads running throuai eartob mA res im dfferent pco に le have created vario 9 さ 才 and their uSe Lansport things. and sem and safeb。 Throughow rms Of m 、計 避 imperstive for societis 2 id ue st all aroum 7hese now cis le to move Tartes have enabled people hese roufes 記ormaien from one place to amother 9 ickiy jmformati important in our daily Hves. jistopr they have been iy on knd。 They graduay re often fonmed natural Eary routes were 0 oer iong periods of tmme while PeoPIe Pa PC jane turming point in their history arrived when the firs incant turmi led them on foot か jm andient dimes. Once this happened, people Jeeped me importance of welhmaintained routes. Therefore, towms. di and cmiire comtries improved them in order to prosper. As a resull j Became more convenient。 communities greweconomies evolved, and cuitures expanded。 The importance of land routes increased further。 especialjy after the appearance of automobiles。 ) People have estabished routes on water。too. Rivers and canals have erved as effective routes for people to move around and carry things。 For fsrance ji the od japanese city of Edo, water routes were used for the Transporration of agricultural products, seafood, and wood. which supported Te GyS lfe and economy People have also opened routes across the sea. The seaways, which developed based on winds。 waves Yater depths、 am Cestine geography, were "for the nawigation of ships。 particularly im miy by wind power Tel could hanel great dtanes and go tb places The days when they moved mai Using these sea routes Ca routes emerged, leadimg to te exchange of natural Sources, products ang ideas. Th i adi y。 ThiS in tum、helpea on の

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Mathematics Senior High

この問題って 正弦定理と余弦定理どっち使って解いた方が 後々有利になりますか?

Tu9>5w5wtww 1 へABC において, g=ソ2 . 22. 人430* のとき。 刀』Cを求めよ。 層 っ革を148.1 形の 2 辺と1対角 が与えられた場合 まず、 余弦定理 でc を求めるか。 正蓄定理 で を求める (| その際。それぞれ2 通りの値が得られることには奄- 7 なお、国較では 等式 c=6cos.4 gcosど (の 栓時 参照) を利用する LE胡3 > ーー 余玉定理により (ソ2)ーダ+cー2.2ccos30 ょって @ー273c+2=0 ゆえに c=Y3キ1 由利] <=Y3 +1のとき +1+(/2 を 2(73+D_ _+ Gi 2 -訪Ga 1: ゆえに ニー45* よって で=180*一(30*十45)ニ 7| [2] c=Y3 =1のとき 本CB DCo)どの 321-73) __ 1 203=0:72 。 272(73-0 72 ゆえに g=135* よって C=180一(30寺135)ニ15* 3 +1, ガー45"、Cニ105* (画机1 の多考図 以上から または cニゾ3 1,ゼー135*、Cニ15* バ 時 正定理から ニラューーツ5 ゅぇに smpー 2 samaw02N Maな のーー * 4=30' より, 0*く<150* であるから [=45?のとき C=180*一(30'士455 2cos4Tgcosg =2cos30'エ2 co <c=2cos24 Fcos =2cos30*二ツ2 cos45*王3 1 [2] g=135*のとき 180一3135)ニ15* En 6cos 4上2cos2cos30*十2 cos135*=ニ73 1 =5cos4+ecosg 第1奈弦定理 | の図で. [1] <C=90'のとき c=c。 ね ーccosお6cosC / 隊 9<C<iB0' のとき 。=ccosg-2cosQ80-C) 0 人。 計ら 三ccos二ヵcosC 2 則 防から ca=ccsgT2cosC 器証dWGiit 6ごccosC+ccos4。 c=ム Ni ・ c6cos4+o を 第1 余多定理、ヵ.230 回を 第2余弦定理 2 )

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