# Area & Circumference of Circle

Examples, solutions, worksheets, videos, and lessons to help Grade 7 students know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle.

Common Core: 7.G.4

### Suggested Learning Targets

• I can state the formula for area and circumference of a circle.
• I can use the formula for the area of a circle to solve problems.
• I use the formula for the circumference of a circle to solve problems.
• I can identify or produce a logical conclusion about the relationship between the circumference and area of a circle (e.g., given three circles with the areas A1>A2>A3, the circumferences satisfy C1>C2>C3).
• I can write my solutions in terms of pi(π), decimals, and fractions.

Know and use the formulas for area and circumference of a circle (Common Core 7.G.4)

Circle: Area and Circumference (7.G.4)
What is pi?
Rule: The ratio of a circle’s circumference to it’s diameter is always the same number.
Circumference Formula
Area Formula
In this video, students will learn to find the area of a circle using the formula. This video relates to Common Core Standard 7.G.4. Students learn about pi, the radius, square numbers and the procedure for finding the area of a circle.

Circumference of a circle: Finding diameter and area given the circumference

Find circumference given area

Circles Radius Diameter & Pi Learn circumference, radius, pi and more through music.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.