6.2.1 Use Proportions to solve Geometry Problems.

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Presentation transcript:

6.2.1 Use Proportions to solve Geometry Problems

 For any proportion, the reciprocal is also true Write and equivalent proportion: Cross multiply to check your work:

 For any proportion the means can be interchanged to make an equivalent proportion Write an equivalent proportion using the mean interchange property Cross multiply to check your work:

 For any proportion the denominators can be added to the numerators to make an equivalent proportion Write an equivalent proportion using the Proportional Addition Property Cross multiply to check your work:

 A scale is when something is drawn based on a ratio  Example: in real life my car is 17 ½ feet long, what is the scale based on the model? (show model car to class)

 p. 367   3, 5, 8, 11, 16, 19, 21, 24, 37