unit 4A vocab

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Across
  1. 4. measure: θ times the radius of a circle.is a degree measurement, equal to the central angle that forms the intercepted arc
  2. 6. space between two intersecting lines or surfaces at or close to the point where they meet. the figure formed by two rays.
  3. 9. radius times two. a straight line that runs from one side of a figure and passes through the center
  4. 10. of a Sector: Central angle times radius squared divided by 2. is the amount of space enclosed within the boundary of the sector
  5. 11. point at which the perpendicular bisectors of the sides of a triangle intersect and which is equidistant from the three vertices. (y-y1) = m (x-x1)
  6. 14. a circle is a straight line segment whose endpoints both lie on a circular arc. Two times radius squared times distance squared.
  7. 17. Angles of a Circle Theorem:the average of the measures of the two arcs that are cut out of the circle by those intersecting lines. The measure of the interior angle x is equal to half the sum of intercepted arcs.
  8. 18. of Tangency: is a straight line which touches the circle at only one point. y = mx ± a √[1+ m2]
  9. 19. a line segment extending from the center of a circle or sphere to the circumference or bounding surface. Circumference over two times pi.
Down
  1. 1. part of the circumference of a circle or other curve.any smooth curve joining two points
  2. 2. x = 1 cos x.is a line passing through two points of a curve
  3. 3. Chord Theorem:∠BAD ≅ ∠BCA. in any circle, the angle between a chord and a tangent through one of the end points of the chord is equal to the angle in the alternate segment.
  4. 5. is the set of all points in the plane that are a fixed distance (the radius) from a fixed point (the center). A round edgeless, 2d shape.
  5. 7. Arcs:An arc whose measure is greater than 180 degrees.s = 2 π r (θ/360°)
  6. 8. meeting point of two lines that form an angle. the point at which an axis meets a curve or surface.
  7. 11. Angle: Arc length over radius length. an angle with its vertex at the center of a circle and with sides that are radii of the circle.
  8. 12. Arcs:An arc whose measure is less than 180 degree
  9. 13. the quantity that expresses the extent of a two-dimensional region, shape, or planar lamina, in the plane.Length times width.
  10. 15. Angle:the angle formed in the interior of a circle when two chords intersect on the circle. m∠ABC=12m∠AOC
  11. 16. Length: the length of a segment of an arc. Commonly seen as s=r theta