Centroid Set

Orders may be placed by:

FAX: 865-465-8130 EMAIL
PHONE: 865-933-5823

Please confirm FAX orders by telephone or email, and contact us by telephone or email if you need assistance.

School Purchase Orders are always welcome.

Additional shipping charges will be applied to orders outside the US. Please contact us by email before placing your order.

A+ Compass
673 Southview Circle
Kodak, TN 37764



All A+ Compass products are guaranteed for one year against breakage and malfunction that occurs during normal use. Replacement parts are available. Lost parts may be replaced at cost. Refunds, in full, will be issued upon return of merchandise. Refund will include cost of parcel post U.S. mail shipping. Please contact us by telephone for prompt attention to you needs.


Centroid Set

This set includes three distinct triangles and a quadrilateral made from precision LASER cut 1/4 inch thick plastic. The set is designed to explore two methods of finding the centroid and is intended for use with standard compass and straightedge methods as well as Geometer Sketchpad. The first method uses the pedestal to find the balance point. The balance point is the CENTROID assuming uniform thickness and density of the material. The second method uses the intersection of two vertical lines found by suspending the respective pieces from the post on the bent plastic frame (frame includes an inscribed vertical line). The intersection occurs at the CENTROID.

If you previously purchased the centroid set and would like to add the quadrilateral please contact us through our website. We will send you this piece for $4.00 including shipping. Payment by check or PAYPAL.

This item includes a FREE copy of CD#2: Problems and Puzzles in Plane and Solid Geometry.

Closeout Price: $20.00



Centroid Set
(plus shipping and handling)

Closeout Price: $20.00

Do you live outside of the USA?

We welcome worldwide customers but we must verify shipping costs before accepting orders and shipping our products. Please email us to confirm shipping costs before you use PAYPAL.

All A+ Compass tools are intended for use by adults and supervised children eight years old and up. Plastic and metal objects should not be placed in mouth and are intended for instructional use only.
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