Do Now 2/4/13 Take out HW from last night. Text p. 291, #8-20 all Text p. 291, #8-20 all Copy HW in your planner. Text p. 295, #6-9 all, & 12 Text p. 295, #6-9 all, & 12 Quiz sections 6.4 & 6.5 Wednesday Quiz sections 6.4 & 6.5 Wednesday In your journal, explain the difference between similar figures and congruent figures. Then draw and label examples of similar and congruent figures with the correct markings.

Homework Text p. 291, #8-20 all 8) 9) 10/13 10) 1/1 11) 2/3 12) 3/2 13) 128° 14) 110° 15) 18 inches 16) always 17) sometimes 18) always 19) sometimes 20a) No b) yes, computer 1 c) they are the same, 16/9

Objective SWBAT find unknown side lengths of similar figures

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)

Section 6.5 “Similarity and Measurement” Given ABCD ~ GHIJ, find HJ. G H IJ AB CD x 16 Cross multiply

C A B b a F D E Given ABC ~ DEF, find a and b.

C A B a Z Y X z Given ABC ~ XYZ, find a and z.

Indirect Measurements You measure the shadow of a telephone pole to be 24 ft. The shadow of a 5ft-tree is 4 ft. How tall is the telephone pole? S H s h

Indirect Measurements To estimate the height of the Transco Tower in Houston, TX, you measure its shadow to be about 55m. The shadow of a 50m flagpole is about 10m. Estimate the height of the Transco Tower. S H s h

Using Algebra and Similar Triangles B A E C D Given ABC ~ DEC, find BE. x Cross multiply

Homework NJASK7 Prep Text p. 296, #6-9 all