Illuminations
Circumference and Areas of Circles
Middle and high schoolers listen to a scenario about a puppy and use the scenario to develop formulas in order to find the area of a circle. In this circumference lesson, pupils understand how to find the radius, diameter, area of a...
Curated OER
Discovering Pi/Welcome to Pi Day
Students explore pi. In this circle measurement lesson plan, students define and identify radius, diameter, circumference, and perimeter. Students work in groups to measure several plastic lids and record their findings. Students compare...
Curated OER
Area of Circles and Probability
Students investigate the area of squares and circles. In this geometry activity, students calculate the area and probability of simple events. They work on a laptop using Safari.
Curated OER
Circle Formulas
Tenth graders apply various circle formulas to determine radii, diameter, circumference, area, arc length, and sector area. The two page activity contains twenty-five problems. Answers are not provided.
Curated OER
One Revolution for Robot
Students calculate the revolution and circumference of circles. In this calculus activity, students derive the formulas for their given shape. They use the d=rt to calculate the distance and rate of travel.