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Do Now 2/23/10

Do Now 2/23/10. Take out HW from last night. Text p. 291, #8-20 all Copy HW in your planner. Text p. 295, #6-9 all, & 12 Quiz sections 6.4 & 6.5 Monday Review “Geometry NJASK7 Prep” assignment on MySkillsTutor – Quiz Friday

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Do Now 2/23/10

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  1. Do Now 2/23/10 • Take out HW from last night. • Text p. 291, #8-20 all • Copy HW in your planner. • Text p. 295, #6-9 all, & 12 • Quiz sections 6.4 & 6.5 Monday • Review “Geometry NJASK7 Prep” assignment on MySkillsTutor – Quiz Friday • 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.

  2. 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 HomeworkText p. 291, #8-20 all

  3. Objective • SWBAT find unknown side lengths of similar figures

  4. Section 6.4 “Similar and Congruent Figures” Properties of similar figures: 1). Corresponding angles are congruent 2). Corresponding sides are proportional (equal ratios)

  5. Section 6.5 “Similarity and Measurement” Given ABCD ~ GHIJ, find HJ. 30 H G x I J Cross multiply 12 A B 16 C D

  6. Given ABC ~ DEF, find a and b. D A 40 20 32 F E b 35 B C a

  7. Given ABC ~ XYZ, find a and z. Y z X A 24 40 25 Z 20 B C a

  8. 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? H h S s

  9. 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. H h S s

  10. Using Algebra and Similar Triangles Given ABC ~ DEC, find BE. A D 20 15 x 36 C B E Cross multiply

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

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