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Honors Geometry 18 Oct 2011 Take papers from your folder and put them in your binder. Place your binder, HW and text on your desk. Warm-up- silently please (use 1 sheet for week) Sketch the figure on your warm up paper and answer the questions using proper naming. finished? try doing the “line design” on your calculator page- 134 Objective Students will define and classify triangles and apply definitions to solve problems. Students will take notes, participate in a white board review and use think-pair-share as they complete problems. A good definition CLASSIFIES and DIFFERENTIATES A ________ is a _________(what) that or in which________________________. ex: A SQUARE is a polygon that has 4 congruent sides and 4 90⁰ angles. lastly? check for counterexamples Homework due today 1) DO INVESTIGATION on Triangles, pg. 60 – 61 you need to sketch the examples and non-examples and write your definitions for SIX TERMS 2) DO PAGE 62, # 1 – 10 Check your answers √ or X each problem CHAT WITH YOUR GROUP can you find any counterexamples? Refine your definitions if needed Homework due next class Geometry assumptions You MAY assume: Lines are straight and that if they intersect they intersect at one point Points on a line are collinear and that all points in a diagram are co-planar unless the drawing indicates they are not. you may NOT assume that: • Just because two lines LOOK parallel that they ARE parallel unless they are marked or have angle measures indicating they are • Just because two lines LOOK perpendicular that they ARE perpendicular unless they are marked or angle measures indicate they are • pairs of angles, segments, polygons are congruent unless they are marked with information that shows you that they are POLYGONS add to your vocab section WORD DEFINITION POLYGON side diagonal vertices closed figure in a plane formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others. CONVEX polygon no diagonal outside the polygon CONCAVE polygon at least one diagonal is outside the polygon Perimeter the sum of the length of the sides SKETCH and/or example add to your vocabulary section Term Definition Right Triangle Has one right angle Acute triangle Has three acute angles Obtuse triangle Has one obtuse angle Scalene triangle Has no congruent sides Equilateral triangle Has three congruent sides Isosceles triangle Has at least two congruent sides (all three sides have different measurements) Example- ADD MARKINGS Triangles Name the triangle: 13 7 8 Congruent: Name the triangle that is congruent to … N NEW ? D W O E L The perimeter of ABCDE is 94 m. Find the lengths of segments AB and CD C D X 3 16 B A X 8 E B a) Mark the figure to indicate the given information: AB CB mA mC A C B) Copy the figure then mark it to indicate the given information: 1) Point E is the midpoint of 2) 3) CDB BF C CB is a right angle is an angle bisector E F A D B debrief what did you learn today? what was easy? what was difficult? what can I do to help you?