Investigating Geometry: Circles

Henrico County Public Schools

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May 2006

Lesson 8-2: Area and Circumference

Interactive Applet


The area of "Pacman" (also known as a sector) and the area of the completed circle are given.

Video Lecture

Objective:

SOL G.11 c: The student will use angles, arcs, chords, tangents, and secants to (c) find arc lengths and areas of sectors in circles.

 Applet Directions 1 Close 
  1. The opening of pacman's mouth (∠ABC) and radius are flexible.

  2. When pacman eats a ghost, his area is 5/6th of the completed circle.

  3. What is the angle of the opening of his mouth at that moment?

  4. Drag point A or the radius point to change the diagram.

  Hands-On Activities Close 

Dr. Simon Singh hosts a discussion of π (Pi) on a BBC Radio 4 show about numbers. The program is about 14 minutes long. Click here then under Listen Again, click on radio show 2. Pi.


  Other Web Sites Close 

  1. Glencoe: On Line Quiz
  2. E-Z Geometry: Angles and Arcs

  3. Glencoe: Angles and Arcs: On Line Quiz

  4. Circle Vocabulary Online "flash cards"

  5. Circles: math.com This is a four step process: Steps 1 through 3 are similar to a textbook while step 4 is an online multiple choice "quiz" with instant feedback.

 Puzzle & Problems tangram Close 
  1. Wave Area Problem