Presentation on theme: "Do Now 4/1/13 Copy HW in your planner. Be ready to copy POTW #2"— Presentation transcript:
1Do 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
2Objective 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.
3Section 8.1 “Building Blocks of Geometry” Pointan exact location, represented as a dot.LADZK
4Plane a flat surface that extends on forever in all directions. How many planes on this figure?
5Line segmentpart of a line with 2 endpoints and all the points in between.DECF
6Line a straight path extending without end in opposite directions. R S
7Ray Part of a line that begins at a point and extends in one direction without ending.BKAJABKJKA
8Identifying 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.
9Identifying 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)
11Corresponding angles – Remember this?Corresponding angles –matched angles of two figuresWhen 2 angles have the same measure, they are marked with the same symbol.DAFECB
12Corresponding sides – matched sides of two figures Remember this? D A
13CongruentTwo line segments are congruent when they are the same length.3CDEFYou can use tick marks to indicate congruent line segments.
14Congruent 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
15Identifying 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
16Identifying Congruent Line Segments Identify the line segments that are congruent in the figure.ABCDEAB ACOne tick markBC DETwo tick marksBD CEThree tick marks
17Given , find the indicated measure. ZAX15452045Y35°15BC90°35°55°
18Puzzler…Remove 4 of the segments to leave 5 equal squares.