Learn about the geometry of circles with Peter Weatherall’s Circle Song.

Percent Panic is a game for children to see the relationships between: area, percents, and fractions.

Learn to measure density and solve the mystery of the gold crown like Archimedes.

In this lesson, students approximate the areas of different landmasses by decomposing them into triangles and rectangles.

In this lesson, students calculate the area of each pizza to determine how much each square inch costs.

In this lesson, students use the area of circles and fractions to explore how to properly expose a picture, and how photographers use depth of field and motion blur to get the perfect shot.

In this lesson, students calculate circle areas to compare the unit costs of different sized pizzas, find the percent of pizza that is tasty inside vs. crust, and debate whether it’s ever a good idea to order a personal-sized pizza from Pizza Hut.

In this lesson, students use the formula for the area of a circle to calculate how much of a pizza is actually pizza, and how much is crust.

A trapezoid is a quadrilateral with 2 parallel sides

In this activity students explore the relationship between the area of a rectangle and the number of squares that make up a border around it.

This activity allows students to explore how to optimize the packaging of circular objects which relates to many real-life scenarios.

This activity allows students to explore how to optimize the packaging of circular objects which relates to many real-life scenarios.