We created the attached activity to get the students to visualize the circumference of circles in another way. This activity also requires them to measure distances and diameters and calculate the percentage of error. We use a variety of cardboard tubes, pipe, coins, cans, rolls of tape, other.
Perimeter of a Circle Activity
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Standards
Prove that all circles are similar.
Identify and describe relationships among inscribed angles, radii, and chords.
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.
Give an informal argument for the formulas for the circumference of a circle, area of a circle, volume of a cylinder, pyramid, and cone.
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