For this task, students investigate and develop an understanding of the formula for the area of a circle. Aligns with G-GMD.A.1.

A basic review of circles and how to calculate the circumference, radius, diameter, and area. Includes practice questions.

Three circles are mutually tangent. Students are asked to find the total area of the circles plus the area inside where they meet. Students will need to know how to calculate the area of a circle, a sector of a circle, and an equilateral...

In this video, students visit a small-town festival that features the world's largest stainless steel skillet. In addition to a question about scaling recipes, they also are asked how increasing or decreasing the radius of a circle...

This tutorial provides a brief introduction about what area is, then gives the formulas for area of a square, rectangle, parallelogram, trapezoid, triangle, and circle. Examples of each formula are provided.

This site, which is provided for by the University of St. Andrews, contains information on the mathematician Gregory and his accomplishments.

Learn about the radius of a circle with this useful reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

This interactive exercise focuses on working with the radius of various circles to find the circumference and area as well as challenging you to find the distance a square wheel travels around the track.