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# 3c and 4d similar and congruent proportions

## on Jan 01, 2011

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similar and congruent figures - 7th grade math

similar and congruent figures - 7th grade math

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## 3c and 4d similar and congruent proportionsPresentation Transcript

• 3c: Justify congruency and symmetry of two figures (DOK 2)4d: Solve problems involving scale factors using ratios and proportions (DOK 2)
By: Deia Sanders
• Study these pictures
Similar or Congruent?
• Vocabulary
Similar: two polygons are similar if the corresponding sides are in the same proportion; if the polygons are similar, the corresponding angles will be equal.
• Let’s look at pages 138 and 139
• Homework
Handout #1
Pages 155-157
• Day 2
3c: Justify congruency and symmetry of two figures (DOK 2)4d: Solve problems involving scale factors using ratios and proportions (DOK 2)
• Let’s Review from yesterday
Please exchange papers to check homework
• Find Missing Lengths Using Proportions
Turn to pages 140-141
• Examples
• Homework
Complete Handout #2 pages 159-160
• Day 3
3c: Justify congruency and symmetry of two figures (DOK 2)4d: Solve problems involving scale factors using ratios and proportions (DOK 2)
• Let’s Review from yesterday
• Vocabulary
Line of symmetry: a line is a line of symmetry for a figure if the reflection of every point on that figure with respect to the line is also a point of the figure
(Where you can fold and object and it’s the exact same on both sides)
• Turn to page 142
• Examples
• Homework
Handout #3
Page 162
• Closure
Where could we fold you to find your line of symmetry?
• Day 4
3c: Justify congruency and symmetry of two figures (DOK 2)4d: Solve problems involving scale factors using ratios and proportions (DOK 2)
• Congruent: if two polygons are congruent, then their corresponding or matching sides and angles are also congruent. Congruent figures are also similar, so the corresponding sides can also be found using ratios.
Vocabulary
• Congruent = Same
• Turn to the bottom of page 142 and page 143
• Secret trick
The sides and angles of polygons are listed the same order, or order of congruence. You can line up the letters from each figure on top of each other and it will match up the congruent sides and angles.
• Examples
• Homework
Handout #4
Page 164