2. The Week is Almost Half Way Over! Do Now:
A rectangle with perimeter 198 cm is divided into 5 congruent rectangles as shown below. One side of each of the 5 congruent rectangles is 18cm. What is the perimeter of one of the five congruent rectangles?

3. Homework Review
What questions do you have about last night’s homework?

4. Quiz Returns Grading Scheme: Each Problem = 2 Points
1 – 4: Half Credit Awarded if close but not completely correct
5: 2 Parts, 2 Points
6: 0 or 1 part correct = 0 points. 2/3 correct = 1 pt.
7 – 9: 1 pt for correct answer, 1 pt for correct explanation
10: Half Credit Awarded for incorrect calculations but correct procedure/formula

5. Quiz Returns Grading Scheme: Each Problem = 2 Points
1 – 4: Half Credit Awarded if close but not completely correct
5: 2 Parts, 2 Points
6: 0 or 1 part correct = 0 points. 2/3 correct = 1 pt.
7 – 9: 1 pt for correct answer, 1 pt for correct explanation
10: Not Graded. 2 Points automatically - +2 if correct

7. Congruent Polygons
Two polygons are congruent if and only if they are exactly the same shape and size
“If and only if”?
“If and only if means that the statement works both ways:

8. Example:

9. Triangles
The BIG idea for today: A triangle has 180 degrees.

10. Right Triangles Right Triangle: Triangle with one right angle
What do we know about the measurements of the sides?
What do we call a triangle with 2 right angles?
What can we then deduce about the other two angles of a right triangle?

11. Obtuse Triangles Obtuse Triangle: Triangle with Obtuse Angle
Can there exist a triangle with more than one obtuse angles?
What types of angles must the other two angles be? Why?

12. Acute Triangles Acute Triangle: A triangle with 3 acute angles.
What do we call a triangle with 2 acute angles?
What do we call a triangle with only one acute angle?

13. Equilateral Triangles
Equilateral Triangle: Triangle with three equal sides
What does that tell us about the angles of the triangle?
Anything else?
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14. Isosceles Triangles
Isosceles Triangles: Triangle with at least 2 congruent sides
Is this related to equilateral triangles?
What can we deduce about the angles?

15. Fun Facts

16. Scalene Triangles Scalene Triangle: A triangle with no congruent sides
What else can we infer?

17. Practice:
Draw the following. Label your drawings.

18. Homework
“Lesson 1.5” worksheet