2. 10-7 Areas of Circles and Sectors Objective: To find the areas of circles, sectors and segments of circles

3. base = ½ of circumference of circle height =radius of circle Parallelogram A = bh A =½ (2πr) r A = πr 2 The area of a circle is given by the formula _________, A = πr 2 so… where A is the area and r is the radius of the circle.

4. Parts of a circle Sector of a circle: The region between two radii of a circle and the included arc Segment of a circle: The region between a chord of a circle and the included arc

5. Area of the parts SectorSegment a0a0 a0a0 r r h b Area of a Segment is the area of a sector minus the area of a triangle.

6. Examples: Find area of the shaded region 45 0 20 cm 6 cm p.663: 7, 9, 14, 16, 18, 20, 22-24