A Geometry Instructional Unit Plan Similarity

By:

Nikki Masson and Brook Buckelew


Day 2/Lesson 2: Problem Solving in Geometry with Proportions

Goals:

1. Use properties of proportions

2. Use proportions to solve problems.

 

Definitions:

Practice with Geometric Mean:

Find the geometric mean of the two numbers.

1. 8 and 12

2. 18 and 30

3. a and 4a

Click here to see how the Geometric Mean is used to prove the Pythagorean theorem:

More Properties of Proportions:

 

Using the Properties of Proportions:

Applications using Proportions:

1.

 

4. A quality control engineer for a certain buyer found that the ratio of defective units to total units is 1:35. At this rate, what is the expected number of defective units in a shipment of 28,000?

 

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