1.  Grab a red pen and have your homework out ready to grade

2.  Follow the directions in the handout we will discuss together

3. Objective: ________________________ __________________________________

4. Triangle Sum Theorem: The sum of the measures of the angles of a triangle is 180°. _______ + _______+ ______= ________ 1 2 3

6.  A corollary to a theorem is a statement that can be proved easily using the theorem.

7.  Corollary to the Triangle Sum Theorem: The acute angles of a right triangle are complementary. ____ + _____ = ____

9.  Interior angle: angle inside the triangle  Exterior angle: angle formed when one side of a triangle is extended *Only one at each vertex

10.  Exterior Angle Theorem: The measure of an exterior angle of a triangle equals the sum of the measures of the 2 remote interior angles.  _____ + _____ = ______

12. 62° 1 2 3 Find the measure of <1, <2, and <3

14.  Grab a ruler from the clear bin on the counter and partner up with one other person (groups of two)

15.  Warm-up  Objective: TLW define the Sum of angles in a triangle theorem and apply it along with the corollary to problems  Activity-Sums of angles in a triangle  Class practice problems

19.  Now on your own you and your partner are to each cut out one more triangle  Repeat the steps of the activity and see if it holds true for triangles that you created on your own

20.  Grab a blank sheet of notebook paper