Investigating Geometry: Circles

Henrico County Public Schools

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May 2006

Lesson 8-4: Arcs and Chords

Interactive Applet
Video Lecture

Objective:

SOL G.11 a,b: The student will use angles, arcs, chords, tangents, and secants to
(a) investigate, verify, and apply properties of circles;
(b) solve real-world problems involving properties of circles.

 Applet Directions 1 Close 
  1. The green circle has two chords; red and blue.

  2. Their distances to the center are given.

  3. When is the blue chord congruent to the red chord?

  4. Drag the chords to compare.

  Hands-On Activities Close 
  1. Construct circle tangent to circles C.a.R.

  Other Web Sites Close 
  1. Glencoe: On Line Quiz

 Puzzle & Problems tangram Close 
  1. A chord of a circle is 10 inches long and is 12 inches from the center of the circle. Find the length of the radius.

  2. In circle M below, the radius is 10. Chord AB = 16, and chords AB and CD are equally distant from the center. Find the length of EF.
circle