Unit Plan
Khan Academy

Khan Academy: Praxis Core Math: Circles Lesson

For Students 9th - 10th
A basic review of circles and how to calculate the circumference, radius, diameter, and area. Includes practice questions.
Unknown Type
Khan Academy

Khan Academy: Practice: Area of a Circle

For Students 7th - 8th Standards
A practice quiz on calculating the area of a circle. Includes hints.
Activity
National Council of Teachers of Mathematics

The Math Forum: Pi Day

For Teachers 9th - 10th
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.
Lesson Plan
Homeschool Math

Homeschool Math: Circles

For Teachers 4th - 6th
Lesson presents definitions of terms associated with circles and helps learners learn to use a compass to draw circles and simple circle designs.