A comprehensive guide for learning all about chords of a circle with definitions, chords of a circle theorems, intersecting chords theorem, congruent circles, diameter, solved examples, and practice questions.

Seventh graders will measure the circumference and diameter of round things in the classroom and discover the ratio pi. They will see that the ratio of a circle's circumference to its diameter can be used to solve for the circumference...

The interactive tutorial explores the history behind Pi and how to find its value. Students use images of circular objects and find the diameter and circumference to obtain an approximate value of Pi. The resource has an interactive...

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

The innovative resource examines images of the Sun, Moon, Pluto, and all eight planets in the Solar System. Learners calculate the diameter of each object and rank the objects in order of size. The activity has an interactive online...

In this task, students are shown circle formations where an inner circle is surrounded by a set of circles and all circles are touching. In the first situation, all circles have the same diameter. In the second, the inner circle is...

Lesson explores the history, design, and motion of spinning tops. Student teams design and build their own tops that can spin for at least 10 seconds within a circle 30 centimeters in diameter.

Students learn about the engineering design process as they design, build, and test spinning tops using everyday materials. The objective of the design is to have the top spin at least 10 seconds within a thirty centimeter diameter.

The goal of this task is to help young scholars synthesize their knowledge of triangles where only two of the vertices have been given. They will need to know that a triangle inscribed in a circle, with a diameter of the circle as one...

In this task, students investigate how many coins will fit around a central coin when they are all of the same denomination, and if there is room left over. The teacher is given a chart of four coin denominations and their diameters, but...

Need some ideas for Pi Day on March 14th? You can get some great resources at this location. There are all kinds of links available.

View satellite images of the Popigai Crater along with data such as its age, diameter, and exact location. The site links with a comprehensive database that allows you to compare impact craters found around the world.

This site contains an extensive list of various units of measurement known internationally and across several disciplines. Unit symbols are also included.

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.