1. Fundraiser – Keep selling!
Math CC7/8 – Be Prepared
On Desk:
Pencil
Math Journal
Learning Log
Learning Log:
HW: p. 76 #6,7,8,9
*SD Test next Thursday. 9/24 (change)
Fundraiser – Keep selling!

2. Tasks for Today Summarize/Discuss last night’s HW SD Lesson 3.2
Begin HW?

3. Last night’s HW!

4. Summarize lesson 3.1 – show example table
Let’s share some examples….

5. If the sum of 2 proposed side lengths is less than or equal to the third side, no triangle can be constructed!
In NO case can a given set of side lengths be used to make 2 different triangle shapes!
Do make a triangle: (5, 12, 8), (16, 10, 7), (6, 3, 6)
Do NOT make a triangle: (4, 9, 3), (12, 5, 19), (11, 5, 18)

7. Launch video 3.2

8. These SSA won’t create a unique triangle, but some such combinations will.
AAA won’t make a congruent triangle, the side lengths may be different.(similar triangle)
AAS will make a unique triangle because we know the third angle must be degrees. (ASA situation)

9. Draw an equilateral triangle with sides 1 inch.
Use labsheet 3.2B
Draw an equilateral triangle with sides 1 inch.
Draw an angle of 60 degrees and mark 2 sides of 1 inch on the legs of that angle. Then connect the end points.
Draw a right triangle with legs 1 inch and 1.25 inches.
Draw an angle of 90 degrees and mark sides of 1 in. and 1.25 in on the legs of that angle. Then connect the end points.
SAS
SSS
SAS
SAS

10. Use labsheet 3.2B
You need to give either 2 sides and the included angle, or 2 angles and the side.
Angles = 30, 125, 25 degrees
Sides = 1.25, 1.25, and 2.5 inches
Draw an isosceles triangle with vertex angle 40 degrees and equal sides 1.5 in long.
Draw an isosceles triangle with base 1 in. long and base angles 70 degrees.
SAS
ASA
SAS
ASA

11. You need at least 3 sides and/or angle measurements, but not ANY three.
Given SSS - there will only be one triangle.
Given 2 angles and one side length (either the included side (ASA) or the nonincluded side (AAS)), there will be only ONE triangle.

12. All copies of the right triangle using the same 3 sides lengths will make the same triangle.
The order in which you connect the sides does NOT matter. So, the copy will also be a right triangle.