This resource is a complete 7th grade mini-lesson on circles. Included is a detailed lesson plan, note sheets, quiz, vocabulary list, word wall poster, worked out examples, and answer keys to all the above. Only thing not included is homework problems. This unit covers how to find the radius and diameter of a circle, find the circumference and area of a circle given the radius or diameter, finding perimeter and area of a semi-circle. I have used this lesson in my classroom the last 7 years.