30.CAccording to the figure the number of vertices is 10 the number of edges is 15 and the number of faces is 7. ∴Number of vertices ? number of edges number of faces= 10 ? 15 7= 2
Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 7628.A∵All faces of a polyhedron are plane.∴A is not a polyhedron.
Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 762.C∵1plete turn = 360°∴plete turns
Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 7617.Da b c = 180°(∠sum of △)d e f = 180°(∠sum of △)∴a b c= d e fa ? f= d e ? b ? ca ? f= (d ? c) (e ? b)
Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 7615.AIn ?ABC (∠sum of △)
Chapter 9 Symmetry and TransformationChapter 9 Symmetry and TransformationPAGE 66PAGE 67 PAGE 6410.A∵The figure coincides itself by rotating 180°.∴It coincides itself for 1plete revo
Chapter 7 Simultaneous Linear Equations in Two UnknownsChapter 7 Simultaneous Linear Equations in Two UnknownsPAGE 6PAGE 5 PAGE 130.CLet x and y be the ages of Mr. Chan and his son respecti
Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 764.D∵1 right angle equals 90°.∴292.5°
cake is amazing!这蛋糕太好吃了 God, get a room天啊,你躲一边吃吧。3I would get a room with this cake躲一边儿干啥?4I think I could show this cake a good time正是时候让你们看看美味的蛋糕呢。 you had to, what would you give up, food or sex如果
! 嘿!2-Hey! -Hi!-嘿! -嘿!3-How was the honeymoon -Oh, incredible!-蜜月过的怎么样? -哦, 好极了!, candle-lit dinners, moonlight walks on the beach哦, 香槟, 烛光晚餐, 还有银色沙滩漫步was so romantic非常浪漫!6-Where's Mike -He's at the
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