Ab 2 2 - PowerPoint PPT Presentation

图形的相似

图形的相似. 1 ．比和比例的有关概念： (1) 第四比例项：若＝或 a ∶ b ＝ c ∶ d ，那么 d 叫做 a 、 b 、 c 的． (2) 比例中项：若＝或 a ∶ b ＝ b ∶ c ，那么 b 叫做 a 、 c 的． (3) 黄金分割：把一条线段 ( AB ) 分成两条线段，使其中较长线段 ( AC ) 是原线段 ( AB ) 与较短线段 ( BC ) 的比例中项，就叫做把这条线段．即 AC 2 ＝， AC ＝ AB ≈ AB. 要点梳理. 第四比例项. 比例中项. 黄金分割. AB · BC. 0.618.

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Distance Between Two Points

Chapter 6 Coordinate Geometry. 6.1. Distance Between Two Points. 6.1. 1. MATHPOWER TM 10, WESTERN EDITION. Length of a Line Segment. The length of a horizontal line segment (parallel to the x -axis) can be calculated by taking the absolute value

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