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10-7 Areas of Circles and Sectors. Area of a Circle. Area of a Circle : The area of a circle is the product of π and the square of the radius. A = π r 2 What is the area of a circle with diameter 16?. Sectors.

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## 10-7 Areas of Circles and Sectors

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**Area of a Circle**Area of a Circle: The area of a circle is the product of π and the square of the radius. A = πr2 What is the area of a circle with diameter 16?**Sectors**• A sector of a circle is a region bounded by an arc and the two radii to the arc’s endpoints. • You name a sector using one arc endpoint, the center of the circle, and the other arc endpoint. Area of a Sector: The area of a sector of a circle is the product of the ratio of the measure of the arc and 360˚ and the area of the circle.**Finding the Area of a Sector**• What is the area of sector GPH? Leave your answer in term of π.** A circle has a radius of 4 in. What is the area of a**sector bounded by a 45˚ arc? Leave your answer in terms of π.**Segments of Circles**• A part of a circle bounded by an arc and the segment joining its endpoints is a segment of a circle. • To find the area of a segment, draw radii to form a sector.**Finding the Area of a Segment of a Circle**• What is the area of the shaded segment? Round your answer to the nearest tenth.**What is the area of the shaded segment? Round your**answer to the nearest tenth.

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