1. Do Now  Take out your calculator.  Take a vocab sheet from the bookshelf.  Put your 9.5 worksheet on your desk to be stamped. (#1-7)  Find the distance between (5,7) and (-4,2)  Find the angle formed by a 25-ft ladder and the ground if the ladder is leaned up against an 18-ft house.

2. Announcements  Test next Monday/Tuesday.  Unit circle and review today.  More review Wednesday  Trig identities Thursday/Friday  Vocab and review sheet due Thursday/Friday  Test Monday/Tuesday

3. Distance in Coordinate Geometry Review

4. 1. Find the distance between this pair of points (15, 37), (42, 73) 2. Find the perimeter of triangle ABC with vertices A(2,4), B(8,12), and C(24,0). 3. Determine whether triangle DEF with vertices D(6,-6), E(39,-12), F(24,18) is scalene, isosceles, or equilateral. Exit Slip from last week

5. The Unit Circle Trigonometry

6. Today’s Objectives  Define the unit circle.  Use trigonometry to find coordinates around the unit circle.  Use problem solving skills.

7. Angles Redefined  Can an angle be more than 180 o ?  Can an angle be less than 0 o (negative)?  What are some uses for having trigonometric functions for all the angles of a circle?

8. Intro to Unit Circle  Circle centered at the origin (0,0)  Has radius of 1.

9. Unit Circle