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Lesson 1-2Section 1-4
Postulate
Definition
Example 1
Example 2
Definition
Construction
Postulate
Example 3
Example 4
Example 5
What about the distance?
We used the ruler postulate for finding the distance between two points on a line, but how can we find the distance of a line in a coordinate plane?
Let’s see…..
Definition
Example 6
Example 7
Is there another way?
We have now mastered finding the distance between two points in the coordinate plane. However, there is another way of going about it.
We can use a very famous theorem: The Pythagorean Theorem. Let’s see how we do that….
Definition
Example 8
Example 8 cont.
Example 8 cont.
Example 9
Practice
Try the following problems:
Pg. 32 # 5-15 odd , 12
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