1. 8.5 Areas of Circles

2. What is  ? Investigation: A Taste of  p 332  = 3.14159265….. If C is the circumference and d is the diameter of a circle, then there is a number  such that C = _______. If d = 2r, where r is the radius, then C = _______. dd 2r2r

3. Area Investigation: Area Formula for Circles p 433 The area of a circle is given by the formula _______, where A is the area and r is the radius of the circle. A =  r 2

4. 8.6 Any Way You Slice It Cut my pie into four pieces – I don’t think I could eat eight. YOGI BERRA

5. Definitions Sector, segment, annulus

6. Find the area of the shaded sector The sector is 45⁰ and the radius is 20 cm.

7. Find the area of the shaded segment The radius is 6 cm and it is an isosceles right triangle.

8. The shaded area is 14π cm², and the radius is 6 cm, what is the measure of the central angle?