Investigating Geometry: Circles

Henrico County Public Schools

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May 2006

Lesson 8-6: Segment Formulas

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. If you (point A) are standing outside of a large circular water tank with the measurement of the tangent (AB) and the shortest distance to the tank (AC) given, then how can you determine the diameter of the tank?

  2. Drag point A to change the diagram.

  3. Use the arrow keys on your keyboard to view parts of the diagram that are outside of the window.

  Hands-On Activities Close 
  1. Proof A

  2. Proof B

  Other Web Sites Close 
  1. Glencoe: On Line Quiz

 Puzzle & Problems tangram Close 

For the circle shown, AF is a tangent to the circle, and AE are AC secants. Find x and y.

circle