1. Objectives: Develop and use formulas for the sums of the measures of interior and exterior angles of polygons Warm-Up: Seven & eleven are both odd numbers. Your task is to make them both even without performing a mathematical operation. 7 11

2. a segment whose endpoints are the midpoints of the two sides Mid-segment of a Triangle:

3. If a segment joins the midpoints of two sides of a triangle, then the segment is parallel to the third side, and is half its length. Triangle Mid-Segment Conjecture:

4. In triangle DEF, A, B, and C are midpoints. Name pairs of parallel segments.

5. Find DE

6. Find AB

7. D and E are midpoints. Find the measure of <A.

8. In Triangle EFG, H, J, and K are midpoints. Find HJ, JK, and FG.

9. Given DE, DF, and FE are the lengths of mid-segments. Find the perimeter of triangle ABC.

10. Find DE

11. Mid-segment of a Trapezoid: a segment whose endpoints are the midpoints of the non-parallel sides

12. Trapezoid Mid-Segment Conjecture: A midsegment of a trapezoid is PARALLEL to the bases of the trapezoid and has a measure equal to the average of the base lengths.

13. Find NO

14. Find PQ

15. Find KL

17. Find DE, FG, & HI

18. Find AB & CD

19. Find AB, WO, & CD