2. Sec: 3.5 Sol: G.2c

3.  Interior angles  Exterior angles

4. The sum of the measures of the interior angles of a triangle is 180°.

5. The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles. 31 2 Remote Interior Angles Exterior Angle

6. 46 82 5142 4 3 2 1 65

7. 2x + 21 x xX - 20 2x x 3x - 22 80

8. x 3x +6 80

9. 32° 36° z°y°x°46°

10. If two angles of a triangle are congruent to two angles of a second triangle, then the third angles of the triangles are congruent.

11. 4.1 : The acute angles of a right triangle are complementary. 4.2 : There can be at most one right or obtuse angle in a triangle.

12. Classwork: WB pg 75-76 1-10, 14, 16, 17 Homework: pg 175-177 9-14, 17-21, 29, 32