1. 6.2 Use Proportions to solve Geometry Problems

2. Properties of Proportions

3. !That last property from the prior slide!

4. Cross Product

6. Reciprocal Property

9. Scale Drawing A scale drawing is a drawing that is the same shape as the object it represents. The scale is the ratio of the drawing to the actual object.

10. Examples From the given information If we find the cross product 4x = 42 Dividing by 4 we find x = 10.5 This represents BA Please note that DE is smaller than EF. This means that CB must be smaller than BA

11. Example 12x = 21 X = 1.75 X = 48

12. Example The original question asks you to determine if the if –then statement is true mn = 72 mn+9m = 72+9m -9m = – 9m mn = 72