A set of problems of many types.

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### Joel Amidon and Matt Roscoe

A monthly set of problems is aimed at a variety of ability levels.

A set of problems of many types.

### Courtney R. Nagle and Deborah Moore-Russo

Students must be able to relate many representations of slope to form an integrated understanding of the concept.

Students analyze a photograph to solve mathematical questions related to the images captured in the photograph. This month, photographs of the Al Bahr Towers in Abu Dhabi generate questions on area, the Pythagorean theorem and special right triangles, and trigonometric regression.

A set of problems of many types.

### Shawn Triplett

Diagonalization of the Fibonacci matrix ties the sequence to geometry.

### James Metz

Students analyze a photograph to solve mathematical questions related to the images captured in the photograph. This month, photographs of ceiling trusses provide a setting for a geometry discussion.

### S. Asli Özgün-Koca, Michael Todd Edwards, and Michael Meagher

The Spaghetti Sine Curves activity, which uses GeoGebra applets to enhance student learning, illustrates how technology supports effective use of physical materials.

A set of problems of many types.