IJPAM: Volume 80, No. 3 (2012)

INCREASING AND DECREASING OF AREAS

Yutaka Nishiyama
Department of Business Information
Faculty of Information Management
Osaka University of Economics
2, Osumi Higashiyodogawa Osaka, 533-8533, JAPAN


Abstract. This article explains how to help junior-high school students enjoy studying geometry using some card magic. Area may be increased and decreased by arranging pieces of card according to the images on either the front or back of the card. There are some interesting stories associated with this puzzle, including `Sunflowers Facing the Sun' and `The UFO-Spotting Brothers.'

Received: June 5, 2012

AMS Subject Classification: 51M05, 00A09, 97A20

Key Words and Phrases: area, geometry

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Source: International Journal of Pure and Applied Mathematics
ISSN printed version: 1311-8080
ISSN on-line version: 1314-3395
Year: 2012
Volume: 80
Issue: 3