Areas of Plane Figures 11-5 Circumferences and Areas of Circles

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Presentation transcript:

Areas of Plane Figures 11-5 Circumferences and Areas of Circles Circumference of a circle: C = 2πr or C = πd Area of a circle: A = πr 2 Unless specified otherwise leave answers in terms of π.

Examples If 6 oz of dough are needed to make an 8-in. pizza, how much dough will be needed to make a 16-in. pizza of the same thickness. (Hint: compare the areas of the pizza tops.) Answer: 24 oz Find the circumference and area of a circle with radius 25. Answer: 50π, 625π

Practice Assignments CW: p. 447 1-12 even HW: p . 448 2, 6, 10, 14, 17, 18, 24, 26- 28; Section 11.6 Worksheet

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