81 geometric mean -...
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Geo 81 Lesson with notes 4th b.notebook
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March 10, 2016
Feb 148:11 PM
81 Geometric Mean
Learning Targets:I can find the geometric mean between two numbersI can solve problems involving relationships between parts of a right
triangle and the altitude to its hypotenuse
What is one possible problem when taking a picture of a very tall object?
At what vertical viewing angle should the camera be set to use the geometric mean to photograph an object?
What measure do you need when using the geometric mean to photograph a very tall object?
Mar 71:34 PM
Geo 81 Lesson with notes 4th b.notebook
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March 10, 2016
Mar 71:43 PM
Feb 148:16 PM
Geometric mean: when the means of a proportion are the same number. It is the positive square root of the product of the extremes.
Geo 81 Lesson with notes 4th b.notebook
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March 10, 2016
Feb 148:18 PM
Feb 148:18 PM
Example 1: Find the geometric mean of each pair of numbers.
1. 2 and 50 2. 5 and 45 3. 12 and 15
Geo 81 Lesson with notes 4th b.notebook
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March 10, 2016
Feb 148:20 PM
When an altitude is drawn in a right triangle from the right angle vertex, a special relationship happens with the two new triangles.
Feb 148:23 PM
Geo 81 Lesson with notes 4th b.notebook
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March 10, 2016
Feb 148:24 PM
Example 2: Write a similarity statement identifying the three similar triangles in the figure.
4. 5. 6.
Feb 148:29 PM
part = middle part = side middle other part side whole
Geo 81 Lesson with notes 4th b.notebook
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March 10, 2016
Feb 149:01 PM
part = middle middle other part
part = side side whole
Feb 149:07 PM
Geo 81 Lesson with notes 4th b.notebook
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March 10, 2016
Feb 149:10 PM
Example 3: Find each variable.
7. 8.
9.
Feb 149:15 PM
Geo 81 Lesson with notes 4th b.notebook
8
March 10, 2016
Feb 149:16 PM
Example 4:
9. Mrs. Alspach is making a kite for her son. She has two support rods so that they are perpendicular. The shorter rod is 27 inches long. If she places the short rod 7.25 inches from one end of the long rod in order to form two right angles with the kite fabric, what is the length of the long rod?