Geometry Chapter 7 Test Name ___________________________ Solve each proportion for x. If necessary, leave answers as reduced improper fractions (no decimals). 1. 2. 3. Are the triangles similar? If yes, explain by simply stating the theorem or postulate that proves the triangles to be similar. If no, explain why the triangles are not similar. 4. 5. 6. The figures in each pair are similar. Find the value of each variable. 7. x = _________ y = __________ z = __________ 8. x = ___________ y = ____________ 9. These polygons are similar. Finish the similarity statement. ABC ~ __________________ 10. A person 2 m tall casts a shadow 5 m long. At the same time, a building casts a shadow 25 m long. How tall is the building? 11. A video screen is 16 in. wide by 12 in. tall. What is the largest complete video image possible for a picture that is originally 3 in. wide by 5 in. tall? If necessary, find lengths to one decimal place. 12. A map uses the scale 1 cm = 20 mi. A county is 90 mi wide. How wide is the county on the map? If necessary, find lengths to one decimal place. Find the geometric mean. If the answer is not a whole number, leave it in simplest radical form. 13. 3 and 27 14. 10 and 18 Use the figure at the right to complete the proportion. 15. AD ? DG FI ? = _________ 16. JF ? FE DE ? = _________ 17. AD BE ? BH ? = _________ Find the values of the variables. 18. 19. x = ___________ 21. x = ___________ 22. x = ___________ 20. x = ___________ 23. x = ___________ x = ___________ Find the values of the variables. Leave answer in simplest radical form, if needed. 24. 25. x = ___________ x = ___________ y = ___________ z = ___________ 26. Find the similarity ratio of two squares with areas 50 in2 and 32 in2 from the larger square to the smaller square. If necessary, leave your answer as an improper fraction in simplest form. 27. Find the length of the altitude to the hypotenuse of a right triangle whose sides have lengths 6, 8, and 10. If necessary, leave your answer as a decimal to one place. 28. Proof: Given that BC || DE, prove that ∆ABC ~ ∆ADE. Statements Reasons Extra Credit: Find the value of x to the nearest decimal. 4