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What's a Widget_NOTES.notebook January 14, 2013 Widgets Today, we are going to begin with some foundational vocabulary words for this year. You see, Geometry is like taking a foreign language class. I need you to be able to understand what I speak, and I need you to be able to speak it back to me. So...we are going to build our vocabulary today. No worries...this will all be review for you. Ok, now define Zoids. 1 What's a Widget_NOTES.notebook January 14, 2013 To begin, we need some terms to help us define our geometrical world. These are called undefined terms, which are words that cannot be defined by using other figures. Point, Line, and Plane are the building blocks of geometry. 2 What's a Widget_NOTES.notebook January 14, 2013 3 What's a Widget_NOTES.notebook January 14, 2013 Acute Angles Right Angles 4 What's a Widget_NOTES.notebook January 14, 2013 Complementary Angles Obtuse Angles Supplementary Angles Vertical Angles Linear Pairs of Angles 5 What's a Widget_NOTES.notebook January 14, 2013 You Try... For Exercises 1-8, draw and carefully label the figures. Use the appropriate marks to indicate right angles, parallel lines, congruent segments, and congruent angles. 1. Acute angle DOG with a measure of 45° 2. Right angle RTE 3. Obtuse angle BIG with angle bisector IE 4. DG MS 5. PE parallel to AR 6. Vertical angles ABC and DBE 7. Complementary angles A and B with m A = 40° 8. Supplementary angles C and D with m D= 40° 6