Do Now 2/22/10 Take out your HW from last week. Take out your HW from last week.  Text p. 285, #1-10 all Copy HW in your planner. Copy HW in your planner.

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Do Now 2/22/10 Take out your HW from last week. Take out your HW from last week.  Text p. 285, #1-10 all Copy HW in your planner. Copy HW in your planner.  Text p. 291, #8-20 all  Review “Geometry NJASK7 Prep” assignment on MySkillsTutor – Quiz Friday Be ready to copy POTW #4. Be ready to copy POTW #4.

“Basic Geometry Concepts” Point position in space represented by a dot. A Z D K L

Plane a flat surface that extends on forever in all directions. How many planes on this figure?

Line segment part of a line with 2 endpoints and all the points in between. C D E F

Line a straight path extending without end in 2 directions. R T S

Ray Part of a line that begins at a point and extends in one direction without ending. A K A K B AB JK J

Congruent Two line segments are congruent when they are the same length. CD EF 3

Angle Two rays that begin at the same point. C D E Vertex Sides

Naming Angles The following angle can be named in three ways: B C A Vertex

Objective SWBAT identify similar and congruent figures

Homework Text p. 286, #1-10 all 1) M, N, P, R, S 2) 3) plane Y and plane Z 4) 5) 6) 7) quadrilateral DEFG 8) 9) 10)

Section 6.4 “Similar and Congruent Figures” Similar Figures Two 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 congruent 2). Corresponding sides are proportional (equal ratios)

A B C D E F Corresponding angles – matched angles of two figures When 2 angles have the same measure, they are marked with the same symbol.

A B C D E F Corresponding sides – matched sides of two figures

Given ABC ~ XYZ, name the corresponding angles and corresponding sides. C A B Y Z X Sides Angles

C A B F D E Given ABC ~ DEF, find the ratio of the lengths of the corresponding sides. The ratio of the lengths of the corresponding sides is 4/5.

C A B F D E Given ABC ~ DEF, find the ratio of the lengths of the corresponding sides. The ratio of the lengths of the corresponding sides is 2/3.

Congruent Figures Two figures are CONGRUENT FIGURES if they have the same shape AND the same size. Properties of congruent figures: 1). Corresponding angles are congruent 2). Corresponding sides are congruent

Given, find the indicated measure. C A B Y Z X ° 15 90° 35° 55°

Homework Text p. 291, #8-20 all