1. 18 Feb 2011 Warm UP– silently please 1) HOMEWORK DUE NEXT CLASS: pg. 112: # 6, 9, 20 - write basic information and clearly show all your steps so that someone else can easily follow your work WARM UP- find the equation of the line through (-3,0) and (1,8) a. y =21x – 3 b. y =21x + 8 c. y = 2x – 3 d. y = 2x + 6

2. Objective Students will use area formula for circles to calculate geometric probability. Homework Due TODAY pg. 458- plot each of the 4 shapes given on a grid that goes from 0 to 12 on both axises; calculate the area for each shape USE GRAPH PAPER incl. basic info and show all steps clearly and concisely SIGNED PROGRESS REPORT- 200 HW pts. √ or X your answers for full credit

3. Properties of Circles Central Angles: An angle that has its vertex at the center of a circle Sector of a circle is the region between two radii and an arc of a circle.

4. Term Definition Example Circle sector area conjecture The area of a sector of a circle is given by the formula, A is the area and r is the radius of the circle, and ‘a’ is the degree of the inscribed angle

5. Annulus is the area between two concentric (have the same center) circles

6. Geometric Probability outcome- a possible result event- a set of desired outcomes probability- the chance that something will happen, expressed as a decimal, fraction or % Probability = ----------------------------------- # of desired outcomes total # of outcomes possible

7. Geometric Probability pg. 458 The Shape of Things Right on Target Work with your group to do the investigation, steps 1 - 9. Each student must submit a write up clearly showing their work for each step. Be prepared to share your results for step 4 and step 8 with the class. Be ready to justify your answer.

8. Area formulas: Regular Polygons Circles

9. so what??? A small pizza has an 10 inch diameter. A medium with the same toppings has a 14 inch diameter. Predict how much more pizza you get when ordering a medium. Calculate the area for each pizza. How much more pizza do you get with the 14”? Give your answer in square inches and as a %. If the small costs $9.99 and the medium costs $12.99, which is the better deal?

10. Handout Do # 1- 6 go over answers Work with your group to complete 9, 10, 11