Math CC7/8 – Sept. Things Needed Today (TNT): Math Notebook/Pencil/Angle Ruler or Protractor Math Book –Shapes & Designs 2.4 pg. 49 Labsheet 2.4 A&B (located on table by the door) Learning Log: Topic: Ins & Outs of Polygons HW: S &D pg.54 #12, 14, 15 & Triangle WS

What’s Happening? Warm Up Lesson- S&D 2.4! Start Homework

Warm-Up WRITE down each problem & SOLVE Show ALL your work & THINKING

Check your work in a different colored pen or color pencil Answers to Warm Up Check your work in a different colored pen or color pencil

Shapes & Designs, p. 49 Take Notes

Take Notes

The cyclist will have made 1 complete turn The cyclist will have made 1 complete turn. Therefore the exterior angles is 360°.

If finish, begin 2.4 B

Sum of the INTERIOR angles is: S = (n -2) 180 S = (5 – 2) 180 or S = 3(180) Sum of the EXTERIOR angles is 360 , but we can view that as 2(180) So… total sum of interior and exterior angles (T) is: T = 3(180) + 2(180) or T = (3+2)180 = 900 T = 180(5)

T = 180n – 360 is the total interior angle measure. The 360 can be thought of as 180(2). T = 180n – 180(2) Using the Distributive Property, we can now see that we have the formula developed in lesson 2.2, which is T = (n-2)180

3(180) = 540° 360 3(180) – 360 = 180 Total – exterior = interior

x + 2x + 3x = 180 6x = 180 6 6 x = 30 x = 30, 2x = 60, 3x = 90 Supplements: x + 2x + x – 20 = 180 4x - 20 = 180 4x = 200 4 4 X = 50, 2x = 100, x – 20 = 30 Supplements:

S&D p. 54 #12, 14, 15 & Triangle Worksheet (SHOW ALL WORK) Start Homework S&D p. 54 #12, 14, 15 & Triangle Worksheet (SHOW ALL WORK)