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### Planar Geometry

 Geometry is the study of the characteristics and relationships of shapes.  Characteristics include facts about the object and measurements of an object.12-1: Distance FormulaExplanationKahn video: Distance formulaKhan article: Distance formulaKhan video: Simplifying square rootsPractice ProblemsKhan Exercise: Pythagorean theoremKhan Exercise: Distance between two points Khan Exercise: Simplify square rootsworksheet #1worksheet #2 12-2: Midpoint on a coordinate planeExplanationKhan video: Midpoint formulaKhan article: Midpoint formulaPractice Problems:Khan Exercise: Midpoint formulaworksheet #1worksheet #212-3: Basic Constructions Explanations:Notes #1 | Notes #2website - this website has step by step directions to several constructionsTutorials:Crop Circles:How Stuff Works provides an explanation of how to make themNational Geographic Documentary (45 minutes)Creating Line DesignsPractice Problems:12-4a: Using Point-Slope Form to find the equation of a lineExplanationNotes | AnnotatedKhan video: Intro to point-slope formKhan video: Point-slope & slope-intercept equationsKhan Article: Point-slope form reviewPractice ProblemsKhan Exercise: Point-slope formWorksheet #1 | AnswersWorksheet #212-4b: Finding the equation of lines parallel and perpendicular to a given lineExplanationKhan video: Parallel & perpendicular lines introKhan video: Parallel & perpendicular lines from graphKhan video: Parallel lines from equationKhan video: Parallel lines from equation (example 2)Khan video: Parallel lines from equation (example 3)Khan video: Perpendicular lines from equationKhan video: Writing equations of perpendicular linesKhan video: Writing equations of perpendicular lines (example 2)Practice ProblemsKhan exercise: Parallel & perpendicular lines from graphKhan Exercise: Parallel & perpendicular lines from equationKhan Exercise: Write equations of parallel & perpendicular lines (includes horizontal and vertical lines)Worksheet #1 | AnswersWorksheet #212-4 Horizontal and Vertical Lines WS#112-5: Advanced ConstructionsExplanation:Practice ProblemsWorksheet #1Other Constructions: inscribed polygonsCoordinate Geometry Review WS #2