A series of maps is presented for coloring with the fewest possible colors. (SD)

Several activities in which students use geometric shapes and their shadows to study geometric concepts are described. (SD)

By experimenting with measurement on regular and irregular surfaces, students can give an appreciation of the nature of the measurement process. (SD)

Using mirrors mounted on a plywood base to study reflections provides an introduction to the study of transformation. (SD)

Rational points in the plane were defined as points having both coordinated rational. Students solved several problems linking rational points with lines, circles, and other geometric figures. (SD)

This monthly column contains teaching suggestions on: using codes to convey information, flow proofs in geometry, and volleyball and probability. (MP)

A classroom activity is illustrated in which vectors are drawn in the first quadrant of a rectangular coordinate system forming a vector polygon which is then reflected about each axis. (MN)

An elementary knowledge of geometry is shown to be helpful in problem solving, especially in that the shortest distance between two points is a straight line. (MN)

The technique of organizing data in tables to solve counting problems in geometry is illustrated in the solution of five problems. (MN)

The author has selected a number of episodes that illustrate some of the successes and failures of humanity's attempt to find the area of the circle and presents them as problem studies. (MN)

Topics for student projects in geometry are discussed; useful references are included. (JT)

Relationships between elementary analytic geometry and several types of number sequences are discussed. (JT)

Geometry and a hand-held calculator are used to find a value of pi accurate to five decimal places. (CP)

This article provides a manipulative demonstration of the relationship between the squares on the sides of a right triangle. Materials are listed and directions are given for the student. Illustrations are included. (Author/MA)

Activities involving copying, enlarging, and translating stick figures can enhance students' understanding of graphs. (SD)