advertisement

Circle Vocab Chapter 10 1. Center: the name of a circle, all points are equidistant from here. 2. Radius: from center to edge. 3. Diameter: from edge to edge through the center 4. Central Angle: Vertex is the center of the circle. 5. Semicircle: half of a circle 6. Minor Arc: Smaller than a semicircle 7. Major Arc: Larger than a semicircle 8. Arc Addition Postulate: just like segments, arcs can be summed 9. Circumference: Distance around the circle 10. Concentric circles: Circles in the same plane. (think a bullseye!) 11. Arc Length: measured in degrees, the fraction of the circle’s circumference *formula of green sheet!* 12. Sector: region bounded by an arc with two radii endpoints. (like a slice of pie) 13. Segment: region bounded by an arc not going through the center 14. Geometric Probability: allowing points to represent outcomes Chapter 12 15. Tangent Line: line that intersects the circle just once, perpendicular to the radius at that point 16. Point of tangency: the point where the circle and tangent intersect 17. Chord: Line that makes up a segment, not through the center