標題:
此文章來自奇摩知識+如有不便請留言告知
f.2 Plane Geometry
發問:
睇圖丫唔該 http://xs114.xs.to/xs114/07166/Q.png 更新: 第1題的RST是125°
最佳解答:
1.Draw a straight line pass through R and parallel to PQ SRB=180-125(int.∠s,AB//ST) =55 QRB=98-55 =43 q=43(alt.∠s,PQ//AB) 2.Produce BC such that BC meets DE at Y. CYD=37(alt. ∠s, BA//DE) CDY+37=98(ext.∠ of ?) CDY=61 x=61(alt.∠s,CD//EF) EFK+61=180(int.∠s, DE//KF) EFK=119 FGH=255-119 =136 y+136=180(int.∠s, HG//KF) y=44 3.QST=56(alt..∠s,PQ//ST) x=56+30(ext.∠ of ?) =86
其他解答:
第一題不知你問甚麼， 沒有給出角ＲＳＴ的度數， 故無法計算。 In figure 2, Draw a line CJ on BC. CJD=37(alt. angles, BA//DE) CDJ+37=98(ext. angle of triangle) CDJ=61 x=61(alt. angles, CD//EF) Draw a line FK on F. EFK+61=180(int. angles, DE//KF) EFK=119 FGH=255-119 FGH=134 y+134=180(int. angles, HG//KF) y=46 In figure 3, QST=56(alt. angles, QP//TS) x=56+30(ext. angle of triangle) x=86
留言列表
