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8.5 Areas of Circles

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What is ? Investigation: A Taste of p 332 = ….. 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 = _______. dd 2r2r

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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

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

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Definitions Sector, segment, annulus

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

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

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

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