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9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
9 2 Notes (D2 A)
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9 2 Notes (D2 A)

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  • 1. Opener: On your new opener sheet, use the square below to help you explain          why the area formula (discussed last class) for regular polygons          works.  You have until 7:45.  (Remember that you must be working at          the bell in order to get credit). 10 1
  • 2. 9.2: Circles and Regular Polygons 8 10 6 2
  • 3. 1. Find the area of a regular heptagon with a side of 4 cm. 2. Find the area of a regular pentagon with an apothem of 3cm. Would you have to use trig if you were dealing with a hexagon? A nonagon? An equilateral triangle? 3
  • 4. 3. Find the area of a circle with radius of 3x inches. 4. If a circle has an area of 12 cm2. Find the circumference. 4
  • 5. Homework Questions: Take the next 5‐10 minutes to work with your partner  on any homework questions that you had prior to class today.   5
  • 6. Math Raffle:  All your work, as well as the original problem, should be written in  your notes for today. Only write your answer on the math raffle ticket. Raffle #1:  If the area of a regular polygon is 302.4 cm2 and the apothem is 9.6 cm,  what is the perimeter of the polygon? 6
  • 7. Raffle #2: Find the side length of a regular heptagon with a radius of 6 inches and  an area of 48 in2. Raffle #3: Find the area of a regular octagon with a radius of 12 cm. 7
  • 8. Raffle #4:  If the circumference of a circle is 13π inches, what is the area of the circle? Raffle #5:  If an equilateral triangle is inscribed inside a circle of radius 20 ft, what is  the area of the region inside the circle but outside the triangle? 8
  • 9. Raffle #6:  Find the shaded area of the regular hexagon donut below. 8 8 9
  • 10. Exit Slip: Please complete #12 and 16 on page 603 with your partner. Turn in one sheet of paper with both names at the top of it. Next to one  name, put the letter A and next to the other name, put the letter B. Person A should be writing for the first problem, and person B should  be writing for the second problem. Show all your work and include labeled diagrams (just like we did in our notes today). For #12, keep your answer in terms of π (exact!). For #16, round to the nearest hundredth. 10

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