Investigating Geometry: Circles

Henrico County Public Schools

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Sketchpad New file C.a.R. New file GeoGebra Calculator May 2006

Lesson 8-1: Circle Terminology

Interactive Applet

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Video Lecture

Objective:

The student will be able to define and sketch the following circle related objects: circle, radius, chord, diameter, secant, tangent, point of tangency, common tangents, congruent circles, concentric circles, inscribed/circumscribed objects, arc, minor arc, semicircle, major arc, arc length, circumference, sphere, and great circle.

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Construct the following onto circle C: diameter AD (label the other endpoint of the diameter point "D") radius CB chord AB secant BD tangent from D

Applet Hint Close

Your answer should match the image below:

Hands-On Activities Close

Find the Circle’s Center C.a.R. Find Center from 2 points C.a.R.

Other Web Sites Close

Glencoe: On Line Quiz E-Z Geometry: Angles and Arcs Glencoe: Angles and Arcs: On Line Quiz Circle Vocabulary Online "flash cards" 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.