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

 Follow the directions in the handout we will discuss together

Objective: ________________________ __________________________________

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

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

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

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

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

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

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

 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

 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

 Grab a blank sheet of notebook paper