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# Geometry/Notes 6.1

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### Geometry/Notes 6.1

1. 1. SECTION 6.1 - PROPORTIONS• How can I write a ratio?• How can I use the properties of proportions to solve problems?
2. 2. RATIO
3. 3. RATIOS• Should be written in simplest form• 4 to 2, or 4:2 must be reduced to 2:1• Is 3:18 in simplest form?• Can compare 3 numbers • 3 sides of a triangle a:b:c
4. 4. EXAMPLES
5. 5. PROPORTIONS• Proportion – An equation stating that two proportions are equal 4 8 2 4
6. 6. PROPORTIONS• How do you prove two ratios equal a proportion?• Cross – Products!• Do the following ratios form a proportion? 4 24 , 5 30
7. 7. PROPORTIONS• Do the following ratios form a proportion? 0 .4 0 .7• Check , 0 .8 1 .4 6 24• Check , 8 28
8. 8. PROPORTIONSWhat if one of the numbers is missing?
9. 9. EXAMPLES
10. 10. HOMEWORK• Get a poster board for next week• Bring rulers• Page 285 #12 – 24 #28 – 34 (even)
11. 11. LESSON PLANIntro- Not all triangles are congruent. We are going to add similarity, which is a lower level of comparison.Standards- 5.1Supplies – slides, whiteboard, handouts Essential Questions- slide 2 Input-slides 3, 4, 6 Guided Practice – slides 5, 7, 8, 9, and 10 Independent Practice – slide 11Assessment: Quiz and Chapter Test