1. Do Now 1/13/12 Take out HW from last night. Take out HW from last night. Measurements of your bedroom (length & width) and at least 4 objects (bed, dresser, desk, etc…) Measurements of your bedroom (length & width) and at least 4 objects (bed, dresser, desk, etc…) Practice worksheet 4.4 & Punchline worksheet # 145. Practice worksheet 4.4 & Punchline worksheet # 145. Copy HW in your planner. Copy HW in your planner. Practice worksheets 4.5 B & C Practice worksheets 4.5 B & C Did you hand in the POTW #6? Did you hand in the POTW #6?

2. Homework Practice worksheet 4.4 and Practice B 1) Not similar 1) Not similar 2) Similar 2) Similar 3) Similar 3) Similar 4) Not Similar 4) Not Similar 5) Similar 5) Similar 6) Not Similar 6) Not Similar 1. x = 60 cm 2. x = 44° 3. x =21° 4. x = 12 in. 5. 2.8 feet 6. 16.5 feet

3. CHALLENGE PROBLEM HOW CAN YOU USE PROPORTIONS TO HELP MAKE DECISIONS IN ART, DESIGN AND MAGAZINE LAYOUTS?

4. QUESTION To fit into the yearbook, Mrs. Leggio needs class photos to be a specific size without distorting or cropping the image. Which ratio is acceptable without distorting the image? Explain your reasoning. 1) 3in by 6 in 2) 4in by 5in 3) 6in by 15 in

5. Changing the size

6. Objective Lesson Goal: Identify similar figures to find unknown distance or measurements. Lesson Goal: Identify similar figures to find unknown distance or measurements.

7. Cross multiply Section 4.5 “Using Similar Figures” Given ABC ~ JKL, find x and y. Angle B corresponds to Angle K y = 103°

8. . Given ABCD ~ GHIJ, find HJ. G H IJ AB CD 30 12 x 16 Cross multiply

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

10. C A B Y Z X 20 g 25 24 40 f Given ABC ~ XYZ, find g and f.

11. Indirect Measurement the method of using proportions to find an unknown length or distance in similar figures

12. 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

13. 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

14. City officials want to know the height of a traffic light. Estimate the height of the traffic light. 27.25 15 = 48.75 h Write a proportion. 27.25h = 731.25 The traffic light is about 27 feet tall. 27.25 ft 48.75 ft h ft Cross multiply. h ≈ 27 ftDivide each side by 27.25 to isolate the variable. Indirect Measurements

15. What is Your Confidence Level? Get your white board rady!