Investigating Geometry: Similarity

Henrico County Public Schools

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May 2006

Lesson 5-1: Using Proportions

Objective:

The student will be able to use ratios and proportions to solve a variety of problems.

  Hands-On Activities Close 
  1. Modeling (pdf)
  2. Pantograph (pdf)
  Other Web Sites Close 
  1. Glencoe: On Line Quiz
  2. Ratios: math.com This is a four step process: Steps 1 through 3 are similar to a textbook while step 4 is an online multiple choice "quiz" with instant feedback.

  3. Ratio and Proportion This site defines terminology and gives examples. (Terms: ratio, comparing ratios, proportion, rate, converting rates, average rate of speed)

  4. Scale Drawings Activity on scale drawing that utilizes maps.

  5. Ratio and Proportions Activity on the proportion of body parts and the "golden ratio".

  6. Ratio and Proportions General information and examples.
 Puzzle & Problems tangram Close 

The gear ratio of two gears is the ratio of the number of teeth of the larger gear to the number of teeth of the smaller gear. In a set of three gears, the ratio of Gear A to Gear B is equal to the ratio of Gear B to Gear C. Gear A has 36 teeth and Gear C has 16 teeth. How many teeth does Gear B have? Explain your reasoning.

gears