1. Are the following statements ALWAYS, SOMETIMES, or NEVER true?
A segment has two endpoints.
Vertical angles are supplementary.
A linear pair forms complementary angles.
Adjacent angles form a linear pair.
A ray has no endpoints.
Perpendicular lines form congruent angles.
Problem of the Day

2. Section 1-6 Two-Dimensional Figures

3. Then Now Objectives You measured one- dimensional figures.
Find perimeter of two-dimensional figures.

4. Common Core State Standards
Content Standards
Mathematical Practices
Common Core State Standards
G.GPE.7 – Use coordinates to compute perimeters of polygons and areas of triangles and rectangles.
2) Reason abstractly and quantitatively. 6) Attend to precision.

5. Naming a Polygon

6. Equilateral Polygon: a polygon in which all sides are congruent
Equilateral Polygon: a polygon in which all sides are congruent. Equiangular Polygon: a polygon in which all angles are congruent. Regular Polygon: a polygon that is both equilateral and equiangular.
Vocabulary

7. Find the perimeter of ∆ABC with vertices A(-1, 4), B(-1, -1), and C(6, -1).
Example 4

8. Find the perimeter of ∆ABC with vertices A(-1, 2), B(3, 6), and C(3, -2).
Example 4