1. The perimeter of a square is 24 feet. Find the length of its diagonal.
Problem of the Day

2. Section 8-3b Special Right Triangles (30° - 60° - 90°)

3. Then Now Objectives You used properties of equilateral triangles.
Use the properties of 30° - 60° - 90° triangles.

4. Common Core State Standards
Content Standards
G.SRT.6 – Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.
Mathematical Practices
1) Make sense of problems and persevere in solving them.
7) Look for and make use of structure.
Common Core State Standards

7. Find x and y.
Example 1

8. Find x and y.
Example 1

9. Find x and y.
Example 1

10. Find x and y.
Example 1

11. Find x and y.
Example 1

12. Find x and y.
Example 1

13. Find the length of the side of an equilateral triangle that has an altitude length of 11 3 .
Example 1

14. p.563 #18 – 22, 26, 46
Homework