Source: Kaplan GED Test Prep 2022–2023 by Caren Van Slyke Authority Tier: Commercial Preparation (
TIER_3_COMMERCIAL) | License: Restricted Reference (RESTRICTED) Coverage: Chapter 7: Geometry (Pages 857–912) Curriculum Standard: High School Equivalency Preparation
Kaplan Reference: Chapter 7: Geometry
Lesson 1: Plane Figures
(Page 857)
CHAPTER 7 Geometry Lesson 1: Plane Figures Key Ideas Plane figures are classified by the properties of their sides and angles. The sum of the interior angles of any four-sided plane figure is 360°. By using the properties of any four-sided plane figure and algebraic reasoning, you can find missing angle measures. Four-Sided Plane Figures A plane figure is a set of line segments, all lying on a single plane. To prepare for the GED® Mathematical Reasoning Test , learn the properties of each shape. You will need to identify the characteristics of different types of four-sided plane figures and draw conclusions about their angles and sides. You are already familiar with rectangles and squares. A rectangle is a four- sided figure with four right angles. The opposite sides (sides across from each