Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 764.D∵1 right angle equals 90°.∴292.5°
Chapter 4 Study of 3-dimensional FiguresChapter 4 Study of 3-dimensional FiguresPAGE 88PAGE 87784.AThere are 21 planes of reflection in a right regular 21-gonal pyramid.
Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 762.C∵1plete turn = 360°∴plete turns
Chapter 5 Basic Concepts of PercentagesChapter 5 Basic Concepts of PercentagesPAGE 136PAGE 135 PAGE 1134.A
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 Identities and FactorizationChapter 4 Identities and FactorizationPAGE 88PAGE 87 PAGE 7014.D(?ab ? c)2? [?(ab c)]2? (?1)2(ab c)2? a2b2 2abc c2or (?ab ? c)2? (?ab)2 ? 2(?ab)(c)
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 9 Symmetry and TransformationChapter 9 Symmetry and TransformationPAGE 78PAGE 65 PAGE 6424.DThe process of rotating the triangle made up of solid lines clockwise by 90° about S an
Chapter 4 Basic GeometryChapter 4 Basic GeometryPAGE 112PAGE 111 PAGE 7615.AIn ?ABC (∠sum of △)
Chapter 9 Symmetry and TransformationChapter 9 Symmetry and TransformationPAGE 90PAGE 89 PAGE 649.A∵Rotate the figure about A for 1plete revolution it coincides with the original figu
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