Presentation on theme: "Do Now 4/1/13 Copy HW in your planner. Be ready to copy POTW #2"— Presentation transcript:
1 Do Now 4/1/13 Copy HW in your planner. Be ready to copy POTW #2 Text p. 312, #1-16 all, 21Be ready to copy POTW #2
2 Objective SWBAT identify and describe geometric figures In your notebook, list as many words as you can that can be associated with “geometry.” For each word draw the matching symbol or figure.
3 Section 8.1 “Building Blocks of Geometry” Pointan exact location, represented as a dot.LADZK
4 Plane a flat surface that extends on forever in all directions. How many planes on this figure?
5 Line segmentpart of a line with 2 endpoints and all the points in between.DECF
6 Line a straight path extending without end in opposite directions. R S
7 Ray Part of a line that begins at a point and extends in one direction without ending.BKAJABKJKA
8 Identifying Points, Lines, and Planes Identify the figures in the diagram.GHIFA. four pointsH, G, I, and FChoose any two points on a line to name the line.B. two linesIH, HFC. a planeplane IGFChoose any three points, not on the same line, in any order.
9 Identifying Line Segments and Rays Identify the figures in the diagram.MNOA. three raysName the endpoint of a ray first.MN, NM, MOB. two line segmentsUse the endpoints in any order to name a segment.MN, MO
10 “Similar Figures” Similar Figures Remember this?Similar FiguresTwo figures are SIMILAR FIGURES if they have the same shape but not necessarily the same size. The symbol ~ indicates two figures are similar.Properties of similar figures:1). Corresponding angles are congruent2). Corresponding sides are proportional (equal ratios)
11 Corresponding angles – Remember this?Corresponding angles –matched angles of two figuresWhen 2 angles have the same measure, they are marked with the same symbol.DAFECB
12 Corresponding sides – matched sides of two figures Remember this? D A
13 CongruentTwo line segments are congruent when they are the same length.3CDEFYou can use tick marks to indicate congruent line segments.
14 Congruent FiguresTwo figures are CONGRUENT FIGURES if they have the same shape AND the same size.Properties of congruent figures:1). Corresponding angles are congruent2). Corresponding sides are congruent
15 Identifying Congruent Line Segments Identify the line segments that are congruent in the figure.AB CDOne tick markAC BDTwo tick marksBF DF EC AEThree tick marksThe symbol means “is congruent to.”Reading Math
16 Identifying Congruent Line Segments Identify the line segments that are congruent in the figure.ABCDEAB ACOne tick markBC DETwo tick marksBD CEThree tick marks
17 Given , find the indicated measure. ZAX15452045Y35°15BC90°35°55°
18 Puzzler…Remove 4 of the segments to leave 5 equal squares.
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