The Week is Almost Half Way Over! Do Now:

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Presentation transcript:

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?

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

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

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

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:

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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?

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?

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?

Equilateral Triangles Equilateral Triangle: Triangle with three equal sides What does that tell us about the angles of the triangle? Anything else? Click Here

Isosceles Triangles Isosceles Triangles: Triangle with at least 2 congruent sides Is this related to equilateral triangles? What can we deduce about the angles?

Fun Facts

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

Practice: Draw the following. Label your drawings.

Homework “Lesson 1.5” worksheet