Circumference Definition: The distance around a circle. It’s a special word for perimeter. Picture:

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Presentation transcript:

Circumference Definition: The distance around a circle. It’s a special word for perimeter. Picture:

Pi: 𝜋 Definition: The ratio between the circumference and diameter of an circle. Picture: ***Use the 𝜋 key on your calculator. If you do not have a 𝜋 key, then use 3.14.

Circumference Formulas C= 𝝅𝒅 or C = 2𝝅𝒓 d = diameter r = radius C= circumference

Let’s Practice… Round all answers to nearest tenth (0.1) If a circle has a radius of 5, what is it’s circumference? If a circle has a diameter of 7, what is it’s circumference? If a circle has a circumference of 12𝜋, what is the diameter? If a circle has a circumference of 20𝜋, what is the radius?