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 #1Pages 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

Please exchange papers to check homework for a grade

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