This document discusses proportions and ratios. It explains how to write ratios in simplest form by reducing fractions and how to use cross-products to determine if ratios form a proportion. Examples are provided to check different ratios. The homework assigned is to complete problems from pages 285-287 of the textbook.

2. SECTION 6.1 - PROPORTIONS
• How can I write a ratio?
• How can I use the properties of proportions to solve
problems?

3. RATIO

4. 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

5. EXAMPLES

6. PROPORTIONS
• Proportion – An equation stating that two proportions are
equal
4 8
2 4

7. PROPORTIONS
• How do you prove two ratios equal a proportion?
• Cross – Products!
• Do the following ratios form a proportion?
4 24
,
5 30

8. PROPORTIONS
• Do the following ratios form a proportion?
0 .4 0 .7
• Check ,
0 .8 1 .4
6 24
• Check ,
8 28

9. PROPORTIONS
What if one of the numbers is missing?

10. EXAMPLES

11. HOMEWORK
• Get a poster board for next week
• Bring rulers
• Page 285
#12 – 24
#28 – 34 (even)

12. LESSON PLAN
Intro- Not all triangles are congruent. We are going to add
similarity, which is a lower level of comparison.
Standards- 5.1
Supplies – slides, whiteboard, handouts
 Essential Questions- slide 2
 Input-slides 3, 4, 6
 Guided Practice – slides 5, 7, 8, 9, and 10
 Independent Practice – slide 11
Assessment: Quiz and Chapter Test